trek top fuel suspension setup

2022 Trek Top Fuel Review | All-new frame & geometry, with a whole new attitude

The not-so-minor details, 2022 trek top fuel 9.8 xt.

https://www.trekbikes.com/

- Brilliant trail-ripping geometry - Active and supportive suspension - Masses of cornering grip & stability - Refined and practical frame design - Downtube storage is a welcome addition

- Dropper post is sluggish - Wheels are solid but quite heavy - Carbon bars are harsh - Heavier than many of its competitors

Flow reviews the 2022 Trek Top Fuel

The Trek Top Fuel has long been known as the American brand’s flagship full suspension XC race bike, purpose-built to to compete at the very highest level of the sport. In more recent years however, the Top Fuel has steered in a different direction. With the short-travel Supercaliber taking over duties for World Cup XCO racing, Trek has softened the Top Fuel’s serious, race-focused persona, adding travel and bulking it up in the process.

For 2022, the Trek Top Fuel makes its biggest move away from its XC racing roots. Equipped with a brand new frame, an updated suspension design and some thoroughly modern geometry, the Top Fuel aims to retain the pert pedalling performance of its predecessor while significantly boosting its all-round capability. So, has Trek succeeded?

Watch our video review of the new Trek Top Fuel here:

Along with the active ABP suspension design and chunky tyres, there’s an exceptional amount of grip and support on offer for a 120mm travel bike.

Trek Top Fuel overview

Despite being all-new, the Trek Top Fuel retains its position in between the Supercaliber (the 60mm travel XC race bike) and the Fuel EX (the 130mm travel trail bike).

It’s equipped with a 120mm travel fork just like its predecessor, but rear travel has actually lifted by 5mm up to 120mm. This increase has been achieved with a longer stroke shock (50mm vs 45mm), and Trek has also flipped the orientation of the trunnion-mount. The rocker link now drives the shock via two sealed cartridge bearings to improve sensitivity.

You’ll no longer find a dual remote lockout on the Top Fuel, which leads to a vastly cleaner bike with fewer cables occupying your view from the cockpit. Along with the bigger shock, slacker geometry and 2.4in wide tyres, it is without doubt the most trail-oriented Top Fuel we’ve seen yet.

To put it into context, that sees it move away from the likes of the Orbea Oiz TR and the Canyon Lux Trail , and more towards the direction of the Santa Cruz Tallboy and Pivot Trail 429 .

A new, burlier chassis

Though it looks pretty similar, the Trek Top Fuel frame is all-new for 2022. It’s not so much a radical overhaul, but rather a collection of many small refinements that add up to a more practical package.

The chassis is notably beefier than its predecessor, with the seat tube diameter swelling to the new-school 34.9mm size. As well as increasing frame stiffness, the fatter seat tube is also shorter, allowing it to swallow a modern long-stroke dropper post.

The downtube is also larger, and it now features the integrated storage design we’ve seen employed on the latest Fuel EX and Slash. A latch underneath the bottle cage removes the trap door, providing you access within. A neat tool roll is included with the bike so you can carry a spare tube, levers and CO2. You could also fit a lightweight jacket in there along with some snacks.

Trek has updated the Knock Block headset, increasing the available turning radius from 58° to 72°. This provides you with greater freedom of movement on the trail, but still prevents the handlebar controls from smashing into the top tube. If you’re not into it though, the Knock Block is removable.

Also nice to see is a threaded bottom bracket shell for ease of maintenance, and the rear ABP pivot can now be tightened with a cassette tool. Also new for the Top Fuel is guided internal cable routing – poke the cable in at one end, and it’ll pop out the other, no fishing required.

Trail-leaning geometry

The 2022 Trek Top Fuel has received a series of geometry updates over the outgoing model, bringing it up to speed with other boundary-pushers in this travel bracket. Here are the key numbers;

• Head tube angle: 66°
• Seat tube angle: 76°
• Reach: 420mm (S), 450mm (M), 465mm (M/L), 480mm (L), 500mm (XL)
• Rear centre length: 435mm
• BB drop: 36mm

Compared to the old Top Fuel, the head angle has kicked back by 1.5-degrees and the reach measurements have gone up by 10mm. The seat tube angle has also steepened by 1-degree to improve the climbing position, while the chainstay length and BB drop remain the same.

The Top Fuel still features a Mino Link, but it’s now located at the lower shock eyelet. Bikes will come setup from the factory in the Low position. Flipping that into High will lift the BB height by 7mm and steepen the angles by 0.4°.

You can get even rowdier by fitting a 130mm travel fork, which will kick the head angle back to a very-slack 65.6° in the Low position. And for those wanting to push the needle further, there’s clearance to run 2.5in tyres.

Trek Top Fuel price & specs

We’ll see four Trek Top Fuel models coming into Australia this year – two with alloy frames and two with carbon. All Top Fuel models feature the same geometry, suspension design and travel. They’re all equipped with 29in wheels, and there are five frame sizes available from Small through to X-Large (the XS size with 27.5in wheels won’t be available in Australia).

Pricing kicks off at $3,499 AUD for the Top Fuel 5 and goes up to $8,299 AUD for the Top Fuel 9.8 XT that we have on test here. Additionally, Trek will offer a 9.9 spec via the Project One bike builder program.

You can check out the specs and prices for all those models down at the bottom of the page. Right now we’ll be diving straight into our experience of testing this bike here; the Top Fuel 9.8 XT.

• Frame | OCLV Mountain Carbon Fibre, ABP Suspension Design, 120mm Travel
• Fork | RockShox SID Select+, Charger 2 RL Damper, 44mm Offset, 120mm Travel
• Shock | RockShox Deluxe Ultimate RCT, 185x50mm
• Wheels | Bontrager Line Elite 30, OCLV Carbon Rims, 29mm Inner Width
• Tyres | Bontrager XR4 Team Issue 2.4in Front & Rear
• Drivetrain | Shimano XT 1×12 w/XT 30T Crankset & 10-51T Cassette
• Brakes | Shimano XT 4-Piston w/Ice Tech Rotors
• Bar | Bontrager Line Pro, OCLV Carbon, 27.5mm Rise, Width: 750mm (S), 780mm (M-XL)
• Stem | Bontrager Line Pro, 45mm Length
• Seatpost | Bontrager Line Elite Dropper, 34.9mm Diameter, Travel: 100mm (S), 150mm (M-M/L), 170mm (L), 200mm (XL)
• Saddle | Bontrager Arvada, Austentite Rails
• Confirmed Weight | 12.88kg (Large, Tubeless)
• RRP | $8,299 AUD

This differs from some other brands that utilise a single frame, and simply up-fork and up-shock it to create a slightly longer travel bike (like the Specialized Epic EVO and Orbea Oiz TR). The Top Fuel is not one of those bikes.

Trek Top Fuel sizing & fit

We put the new Trek Top Fuel into the hands of our tester Ben, who owns the current Top Fuel and has also spent considerable time on the Fuel EX. At 181cm tall, Ben’s been riding a size Large across all three bikes.

The Top Fuel is well-proportioned out of the box. The 480mm reach is very long, but it’s balanced nicely with a 50mm stem and the 76° seat tube angle. The Bontrager saddle is totally inoffensive, and we haven’t needed to shunt it into an extreme position just to get it comfortable.

The 760mm wide riser bars are a great match for this bike, and while it may not be totally necessary for all riders, the 170mm stroke dropper post is fashionably long for such a short travel bike.

Suspension & tyre setup

With the anodised sag gradients on the fork and shock, suspension setup is made easy. Weighing 80kg loaded up, Ben’s been running 180psi in the rear shock (26% sag) 80psi in the fork (20% sag).

The factory rebound tune for both the RockShox SID fork and Deluxe shock is quite light, so each rebound dial was set a couple of clicks slower than halfway.

Tubeless rim strips and valves come pre-fitted to the Bontrager wheels, and Trek kindly includes two bottles of sealant with the bike, making tubeless setup the breeze it should be. Pressures were set at 20psi on the front and 22psi on the rear.

Trek Top Fuel weight

Given its swollen proportions, the new Trek Top Fuel has gotten heavier. With the tyres setup tubeless, our test bike came in at 12.88kg without pedals. To put that number into perspective, here’s how it compares to some similarly-priced XC and Trail bikes we’ve recently tested;

• Canyon Lux Trail CF 9 – 11.22kg
• Merida Ninety-Six 8000 – 11.63kg
• Scott Spark 910 – 12.43kg
• Specialized Stumpjumper Pro – 12.84kg
• Trek Top Fuel 9.8 XT – 12.88kg
• Giant Trance Advamced Pro 29 1 – 13.38kg

Trek claims a carbon Top Fuel frame weighs 2.7kg including the rear shock, which puts it on the heavier side of things for a 120mm travel bike. The alloy frame is purportedly a whole kilo heavier again, with a claimed weight of 3.74kg.

The Top Fuel’s rolling stock is also a significant contributor to its overall mass. The Bontrager Line Elite wheels are heavy at 2,071g for the pair (with tubeless strips and valves). Incidentally, these are exactly the same wheels that came on the Slash 9.9 X01 , which is a full-bore enduro race bike.

Trek has also plumped up the rubber. The previous Top Fuel featured semi-slick XR3 tyres, but the new bike is now spec’d with 2.4in wide XR4 Team Issue tyres. They’re not overly heavy at around 800g each, though they do offer significantly better grip across a broader range of conditions.

What does the Trek Top Fuel do well?

From the very first ride the new Trek Top Fuel proved to be easy to get used to, with no quirks to the fit, handling or suspension.

The proportions are significantly broader compared to the outgoing Top Fuel, with the front wheel sticking out much further ahead of the rider. Despite the long reach however, the effective top tube length is basically identical to its predecessor, so the overall cockpit length remains the same.

The steeper seat angle is noticeable though, providing an improved climbing position with your hips placed further over the bottom bracket. As a result, less bum-shuffling is required on stem-chewing ascents.

Pedalling performance is also superb. Despite its burlier exterior, Trek is still prioritising pedal efficiency with the Top Fuel, with the main pivot positioned high and quite far forward of the bottom bracket. Anti-squat is claimed to hover around the 100% mark, and indeed the rear suspension clenches tightly under chain torque, propelling the whole bike forward with minimal energy loss.

Active suspension performance

Despite the trunnion bearing mount and the longer shock stroke, the rear suspension doesn’t feel radically plusher than its predecessor, which already offered great performance. It is noticeably more supportive though, particularly when absorbing square-edge hits at speed, and when returning to earth after boosting off a lip on the trail.

It’s worth noting here that many bikes in the 100-130mm travel bracket make use of a carbon flex-stay design, including the Canyon Lux Trail, Merida Ninety-Six, and Specialized Stumpjumper. As well as being simpler, flex-stay designs are typically lighter too.

In comparison, the Top Fuel sticks with a genuine four-bar platform based around the ABP suspension design. Trek claims the ABP pivot helps to isolate braking forces from the suspension, and indeed it does result in less skipping and skidding when you’re on the brakes on loose, rocky descents.

With all the pivot points rolling on steel ball bearings, the suspension is more active and possesses a more consistent feel to both compression and rebound damping when compared to a flex-stay design. Yes it’s heavier, but the Top Fuel offers notably more active suspension performance, with excellent traction on loose climbs and better reactivity across chattery rock gardens. It’s very impressive for a 120mm travel bike.

Look out Fuel EX!

The geometry is also brilliant, and the handling really sets it apart from the outgoing Top Fuel.

Cornering performance has improved, with more grip courtesy of the longer front end and those XR4 tyres. These are great all-rounders, with a supple casing and surprisingly decent rolling speed given their size and tread pattern.

The new Top Fuel is also much more composed on rough and fast descents. Thanks to the longer reach and slacker head angle, the overall wheelbase length has grown by almost 40mm. That’s huge, and it offers a vastly more planted feel at speed. Along with the big tyres and active suspension, this really is a solid little trail bike.

In fact, the geometry updates kind of make the Fuel EX look a little outdated. The two bikes now share the same head angle, and the Top Fuel has a 10mm longer reach and a steeper seat angle. The front end is quite a bit higher on the Fuel EX though, and that does inspire more confidence on really steep descents.

As mentioned earlier though, it’s possible to fit a 130mm fork to the Top Fuel, which would lift the front end and actually make it slacker than the Fuel EX. Indeed there’s now quite a bit of overlap between the two platforms, leaving us to ponder what could be in store for the next generation Fuel EX.

What does it struggle with?

You’ve likely gathered that the new Trek Top Fuel is more of a muscly trail ripper than a spindly XC featherweight. While it may carry over the name, it’s evolved into quite a different bike compared to its racier ancestors.

The lack of a remote lockout results in a much cleaner cockpit, and we like how it signals the Top Fuel’s commitment to its trail riding intentions. However, it may disappoint those riders and racers who prefer having an instantaneous sprint button at their fingertips.

Indeed with all the updates, and the fact that the new Top Fuel has double the travel of the Supercaliber, there is now an even bigger gap between these two bikes. Riders who are still interested in some part-time XC racing, but aren’t sold on the Supercaliber’s sharp geometry and proprietary IsoStrut suspension design, may be turned off by the Top Fuel’s new attitude.

Of course you could easily inject some speed with some lighter and faster-rolling tyres, like Bontrager’s XR2. There’s also around half a kilo to be saved in the wheelset, which would make a significant difference to the Top Fuel’s acceleration and climbing enthusiasm.

You could also flip the Mino Link into the High position to steepen the angles. In that guise, with lighter wheels and faster tyres, the Top Fuel would make for a comfortable and confidence-inspiring option for those wanting to sign up for the odd endurance race or multi-day event. If you’re serious about your XC racing though, this is not the bike for you – you’ll be wanting to look at the stupendously efficient Supercaliber for such endeavours.

Component highs & lows

The 2022 Trek Fuel 9.8 XT is a solid package out of the box, especially when you consider it comes in $1,600 cheaper than the 2021 model. And that’s with a pretty much identical build kit. How has a new bike gotten cheaper in the midst of a global pandemic and industry-wide component shortages? Heck knows!

There’s not a lot to be said about the Shimano XT groupset – it works, it’s solid, and it’s easy to tune. The I-Spec mounts offer plenty of adjustability for getting the brake and shift levers into the right spot, and the integrated dropper lever is a nice touch too.

The RockShox suspension isn’t quite as sensitive as the Fox equivalent, particularly the SID Select+ fork, which felt a little stickier than we expected. Otherwise the fork and shock perform well, and the ease of setup is great.

The Bontrager dropper post works fine, but the action is sluggish compared to some of its competitors. And while the carbon handlebars offer a nice profile, having spent a lot of time on OneUp handlebars lately, the Bontrager Line Pro feels considerably harsher in comparison.

We’ve had excellent long-term experience with Bontrager’s latest Line Pro & Line Elite carbon wheels , which feature thick carbon beads that are designed to increase impact strength while also reducing the chance of pinch-flats. They’re totally solid and come with an excellent crash-replacement guarantee, while the buzzy 108pt engagement freehub delivers rapid pickup at the pedals. As mentioned earlier though, they are heavy, providing an opportunity to drop significant weight with a wheel upgrade.

Otherwise we’ve been impressed with the frame finish so far. The Mino Link is simple and effective, the Knock Block is totally unnoticeable on the trail, and we’re big fans of the built-in storage from the Burrito Box. Or is it the Kebab Cave? Maybe a Sausage Roll Hole? Sushi Shaft? Cannoli Cavity? Hot Dog Hollow? Spring Roll Room?

Alright, alright! We’ll show ourselves the door…the door that leads into the Spring Roll Room – ha!

Flow’s Verdict

Tying together a whole suite of updates to the frame and suspension design, there are no doubts that the new Trek Top Fuel is a more capable bike than its predecessor. It’s still very efficient, but having adopted a more progressive approach to its geometry, it delivers a significant improvement in stability. Along with the active ABP suspension design and chunky tyres, there’s an exceptional amount of grip and support on offer for a 120mm travel bike.

With all those changes, the Top Fuel moves even further away from the Supercaliber. And for some riders, that gap will be a little too wide.

Trek seems happy to have a clear delineation between the two platforms though. This differs from some other brands that utilise a single frame, and simply up-fork and up-shock it to create a slightly longer travel bike (like the Specialized Epic EVO and Orbea Oiz TR). The Top Fuel is not one of those bikes.

Instead of being a long-legged Supercaliber, it’s really a shrunken-down Fuel EX, albeit one with more contemporary geometry. And having ridden both bikes, unless you really need the extra travel of the Fuel EX, this is arguably the better option.

Sure it may have put off the weight-weenies and lockout-lovers, but there’s no denying that the Top Fuel has broadened its appeal to an even wider range of riders, and we reckon it’s more fun as a result.

2022 Trek Top Fuel 9.9 XTR

• Fork | Fox 34 Step-Cast, Factory Series, FIT4 Damper, 44mm Offset, 120mm Travel
• Shock | Fox Float DPS, Factory Series, 185x50mm
• Wheels | Bontrager Line Pro 30, OCLV Carbon Rims, 29mm Inner Width
• Drivetrain | Shimano XTR 1×12 w/e*thirteen TRS Race Carbon 30T Crankset & 10-51T Cassette
• Brakes | Shimano XTR Race 2-Piston w/Ice Tech Rotors
• Bar | Bontrager RSL Integrated, OCLV Carbon, 27.5mm Rise, 820mm Width
• Stem | Bontrager RSL Integrated, OCLV Carbon, Length: 35mm (S), 45mm (M-XL)
• Saddle | Bontrager Arvada Pro, Carbon Rails
• RRP | $14,199 AUD

2022 Trek Top Fuel 9.7

• Fork | Fox Rhythm 34, GRIP Damper, 44mm Offset, 120mm Travel
• Shock | Fox Float DPS, Performance Series, 185x50mm
• Wheels | Bontrager Line Comp 30, Alloy Rims, 29mm Inner Width
• Drivetrain | Shimano SLX/XT 1×12 w/Deore 30T Crankset & 10-51T Cassette
• Brakes | Shimano SLX 4-Piston
• Bar | Bontrager Line, 27.5mm Rise, Width: 750mm (S), 780mm (M-XL)
• Stem | Bontrager Elite, 45mm Length
• Seatpost | TranzX Dropper, 34.9mm Diameter, Travel: 100mm (S), 150mm (M-M/L), 170mm (L), 200mm (XL)
• Saddle | Bontrager Arvada, Steel Rails
• RRP | $6,299 AUD

2022 Trek Top Fuel 8

• Frame | Alpha Platinum Alloy, ABP Suspension Design, 120mm Travel
• Fork | RockShox SID, Rush RL Damper, 44mm Offset, 120mm Travel
• Brakes | Shimano Deore 4-Piston
• RRP | $5,299 AUD

2022 Trek Top Fuel 5

• Fork | RockShox 35 Silver RL, Motion Control Damper, 44mm Offset, 120mm Travel
• Shock | X-Fusion Pro 2, 185x50mm
• Wheels | Bontrager Alloy Hubs & Alex MD35 Rims
• Drivetrain | Shimano Deore 1×12 w/Deore 30T Crankset & 10-51T Cassette
• Brakes | Shimano MT200 2-Piston
• Bar | Bontrager Comp, 15mm Rise, 750mm Width
• Stem | Bontrager Rhythm Comp, 50mm Length
• Seatpost | TranzX Dropper, 34.9mm Diameter, Travel: 100mm (S), 150mm (M-M/L), 170mm (L-XL)
• RRP | $3,499 AUD
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• Trek Manuals
• TOP FUEL 2022
• Service manual supplement

Trek TOP FUEL 2022 Service Manual Supplement

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Summary of Contents for Trek TOP FUEL 2022

• Page 1 2022 TOP FUEL SERVICE MANUAL SUPPLEMENT...
• Page 2 If threadlocker is not applied, the fasteners may loosen which could damage the bicycle and result in injury to the rider. Copyright 2021 Trek Bicycle Corporation All Rights Reserved...
• Page 3 2022 Top Fuel Headset with Knock Block Notice: To operate the bicylce without a Knock Block chip, a non-block chip must be installed. Tools Upper bearing cover • 2.5mm hex tool Chip bolt — 5252161 • Torque wrench with 2.5mm hex bit •...
• Page 4 2022 Top Fuel Derailleur hanger 25Nm Derailleur hanger Washer, 30mm — W583423 Bolt Tools • 8mm hex tool • Torque wrench (left-hand thread) with 8mm hex bit NOTICE: Do not over-tighten. Over-tightening the bolt WARNING could cause the hanger to break. Do not apply grease to the derailleur hanger or bolt.
• Page 5 2022 Top Fuel Active Braking Pivot (ABP) Carbon frame Aluminum frame Tools Thru axle — W583469 • Bearing press Non-driveside dropout — W5251141 • Cassette lockring tool • Grease Retaining ring — W5251279 NOTICE: The thru axle must be compatible with a UDH —...
• Page 6 2022 Top Fuel Rocker pivot Seatstay 17Nm 17Nm 22Nm Tools Bolt — W600629 • Bearing press Hat-style washer (2mm hat height) — W5257190 • 5mm and 6mm hex wrenches • Torque wrench with 5mm and 6mm hex bits Bearing — W5257592 Apply grease to the : Rocker axle —...
• Page 7 2022 Top Fuel Main pivot 30Nm Chainstay Tools Nut — W584134 • Bearing press Spacer — W440921 • 8mm hex tool • Torque wrench with 8mm hex bit Bearing — W5256338 • Grease Main pivot sleeve — W500592 Apply grease to: Main pivot axle —...
• Page 8 2022 Top Fuel Shock mounts 17Nm 17Nm 10Nm Bolt — W5257188 Tools • Bearing press Bearing — W5257592 • 5mm and 6mm hex wrenches • Torque wrench with 5mm and 6mm bits Hat-style washer (4mm hat height) — W5257189 Lower shock Mino nut Apply grease to: —...
• Page 9 2022 Top Fuel Adjust the geometry Flip the lower shock mount Mino nut and spacer to change the bike’s geometry to fit your riding style or the terrain. Steeper head tube angle Slacker head tube angle 0.5° Mino nut and spacer in the high position Mino nut and spacer in the low position •...
• Page 10 2022 Top Fuel Cable routing         Carbon frames only. 1.7Nm Route cables Dropper cable Notes Rear brake cable • All models feature cable routing tunnels. • Route cables first, then install seat tube cable exit Derailleur cable guide components (4, 5 and 6).
• Page 11 2022 Top Fuel Frame guards — carbon frame 0.8Nm 0.8Nm 0.8Nm 0.8Nm 0.8Nm Chainstay guard — W5257206 Shuttle guard Button head screw — 1042535 Use isopropyl alcohol to clean the frame surface where the guard (4) attaches. Wait for the alcohol to dry before Button head screw —...
• Page 12 2022 Top Fuel Frame guards — aluminum frame 0.8Nm     Downtube guard Chainstay guard — W5259518 Use isopropyl alcohol to clean the frame surface where Button head screw for chainstay guard — 1042535 the guard (3) attaches. Wait for the alcohol to dry before applying the guard.
• Page 13 2022 Top Fuel Down tube storage Carbon frame Aluminum frame 1.5Nm 1.5Nm Storage door Button head screws — 547053 — W583862 (includes nuts, not used on carbon frames) Storage door Button head screw — W583862 — 1042535...
• Page 14 Improper tire size could damage the bicycle Bottom bracket /ISCG tabs frame. Trek recommends 6mm clearance above and on the sides of the tire. Wheel set Maximum tire size 29"...
• Page 15 2022 Top Fuel Suspension The first step in suspension setup is to determine the sag. All other settings should be adjusted after determining the sag. Refer to the suspension setup card included with your bike or the suspension calculator at Trekbikes.com/suspension-calculator.

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Trek Top Fuel 8 review

• Alan Muldoon
• July 27, 2023

Once a lean XC race-focused machine, now a bulked up down-country rig. We test Trek's latest take on its short travel full suspension design.

Trek Top Fuel 8 Credit: Roo Fowler

Product Overview

Overall rating:, trek top fuel 8.

• • Poppy, playful and efficient
• • Available in six frame sizes
• • Internal down tube storage
• • Mino Link flip chip allows geometry tweaks
• • Needs a 180mm rear rotor
• • Accurate rear shock set up is crucial
• • A solid build, so not the lightest in its class

Manufacturer:

Price as reviewed:.

Think Top Fuel, and the image of a XC race bike instantly springs to mind. But like a faded polaroid tucked into the corner for a dusty picture frame, it’s not an accurate representation of the current design. With the Fuel EX increasing in travel, the Top Fuel has been swept along in its backdraft and seen in high definition, it’s now a capable 29er trail bike with modern sizing and 120mm travel and one of the best down-country bikes on sale. 

A dropper post and sorted cockpit complement the Top Fuel’s playful and poppy nature

Trek offers the new Top Fuel in carbon and alloy options, where the Top Fuel 8 tested here is the high-end alloy build. Regardless of frame material all Top Fuels come with integrated downtube storage. And while the quick release hatch under the bottle cage isn’t big enough to cram a three course lunch into the frame, there’s enough space for a tube, multi-tool, a few snacks and a lightweight jacket. 

Down tube storage is handy for those riders who are travelling light

Trek always offers a comprehensive size range; and with frame options from S to XXL, with a tweener M/L option too, the Top Fuel 8 is no exception. It also has geometry adjustment, but rather than having Trek’s signature Mino Link on the seat stay pivot, the Top Fuel has a flip chip at the lower shock mount. In the low setting this gives a relatively tall 340mm BB height for a 120mm bike, which is probably the only carryover from its race-bike roots – designed to let you keep the cranks spinning, and the speed high at all times.

• Best down-country mountain-bike: short travel full-suspension

The rest of the Top Fuel’s vital stats are on the money though, where a slack 65.6º head angle and steep 77.2º effective seat tube angle make it easy to hammer up the climbs and shred the descents. 

Flip chip in the lower shock mount offers 0.5deg head angle and 8mm BB height adjustment

It’s built solid too, the complete bike tipping the scales at 14.89kg. It also comes with a combined rider and bike weight limit of 136kg (300lb) so it’s clearly no wet noodle. Yes, it’s not the lightest for a 120mm bike, and not far off what you’d expect for a 150mm bike, but that’s the price you pay for integrated storage, as the alloy down tube needs reinforcing when you cut a hole in it.

Thankfully, the Top Fuel 8 rides light, as there’s less travel to pull through to get the bike off the ground, so it offers a different ride experience to modern long-travel trail bikes which tend to have one eye on enduro racing. 

The stock RockShox Pike Rush RC fork dishes out 130mm of travel

There are no sag gradients on the 130mm travel RockShox Pike fork, which we assume is down to cost saving, but set-up is still really straightforward with a tape measure to hand. And while the Pike has a reputation for having a sporty, firmer tune, the basic RC version on the Trek felt smooth and composed in all situations. Yes, the RC damper has a very wide range of rebound adjustment, but there’s only a small range that’s actually usable, but it is enough to get the rebound just so; and that’s all that really matters, right?

• Best mountain bike suspension forks: XC, trail and enduro forks

You need to be equally attentive when setting up the rear suspension. Set to 30% sag, the top-end RockShox Deluxe Ultimate RCT shock bottoms relatively easily. So if you want to run the shock softer to achieve a lower dynamic BB height, you’re going to need to add volume spacers. As such, we increased the shock pressure and reduced the sag to 27.5%.

This small change alone was enough to prevent premature bottom out, but we could still use all of the available shock stroke when we really needed it. We also ran the low-speed compression setting in the minus position for maximum plushness. In the low geometry setting we measured rear wheel travel at 115mm, which is 5mm less than claimed. 

One of the biggest differences in terms of ride feel between the Lapierre and the Trek, other than sizing, are the wheels. The Bontrager Line 30 rims have a 30mm internal rim width, 5mm more than the Mavic rims on the Lapierre XRM 6.9 we tested the Trek against. This adds to the overall volume of the tyres and the stiffness of the bike. It is also why we dropped the tyre pressures slightly on the Trek, even though we were running the exact same tyres on both bikes. 

Bolted on chainstay protection is a neat and considered touch

With 108 points of engagement the freehub on the Bontrager rear wheel offers rapid, secure engagement, with less chain slack and chain slap as a result. The bike is not totally silent though as there is a little bit of cable rattle, but it will probably disappear when you stuff the BITS storage box to the gills.

The contact points on the Top Fuel 8 are all sorted and while there’s a stack of stem height adjustment, the three 20mm spacers don’t offer any fine tuning of the handlebar height. So swapping one of the 20mm spacers of a 10mm, a 5mm and two 2.5mm spacers, would be our first move before leaving the store.

• How to: ultimate guide to handlebar cockpit set up

Nothing else needs changing though. The mix of Shimano XT and SLX for the 12-speed drivetrain worked flawlessly in the dry, dusty test conditions, where the smaller 30t chainring is a real saviour on long draggy climbs or on days when your legs feel like lead. 

ABP suspension design transforms the seat stay assembly into a floating brake mount

Performance

The steep seat tube angle on the Trek Top Fuel 8 really helps with the pedalling dynamics on steeper climbs and the cockpit is long enough that even with the shorter 45mm stem, you never feel cramped or uncomfortable when climbing. It’s not so steep though, that it feels like the pedals are behind you when sitting down spinning across flatter, rolling singletrack.

Stand up to sprint and the rear suspension on the Trek clearly gets animated, the rocker link flapping around like the tail on an overly excited puppy. So the best approach is to sit and spin up the climbs, as the shock remains remarkably still and lifeless until you encounter a bump. Also if you really want to go for it on smoother climbs, the rear shock has a firmer pedal threshold setting. In short then, gaining elevation on the Top Fuel 8 is relatively straightforward and painless.

Knock Block 2.0 steering lock with 72º steering angle, protects the frame without limiting steering

So, it’s somewhat surprising just how rapidly you can throw those gains away. This bike simply rips the descents. Given the limited travel it still seems to carry speed everywhere, and while bumps that would normally chip away at your momentum are still felt though the chassis, they do not perturb the Trek one bit. It rails corners too. Simply load up the suspension mid-turn, and the Top Fuel has just the right amount of support and extension to keep the front end loaded, before slingshotting you out of the turn faster than you entered it. Combine the raw speed with the balanced weight distribution, and the Top Fuel 8 is a really fun, exciting ride and blisteringly fast too.

Would the Trek Top Fuel 8 be even faster with a genuinely low geometry setting? You bet it would. But we’d settle for a bigger rotor on the SRAM DB8 rear brake, as this bike is so fast in fact, that the 160mm rotor feels wholly inadequate and it looked like it had been tempered after just a couple of rides. 

• Best cross-country XC mountain bikes: hardtail and full suspension

The Top Fuel 8 is at home on fast sweeping singletrack

At 14.89kg (32.83lb), the Trek Top Fuel 8 isn’t that much lighter than a 150mm bike. So if you want one bike to conquer all trails, it wouldn’t be our first choice. It’s still a great 29er trail bike though, and if bike park laps and enduro racing don’t fall under your trail bike remit, the Trek Top Fuel 8 offers a fast, fun and engaging ride. Its poppy playful nature, combined with generous sizing means you never feel limited by the travel for regular trail riding. Yet, it still feels more energetic and efficient under pedalling than than most 150mm bikes. It’s a heady combination that manages to keep both the tempo and fun factor high, without any apparent lows.

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Tested: Trek Top Fuel

Don't call it a race bike. Trek's new Top Fuel is for railing steep fast decents with no course tape in sight.

Takeaway: Trek’s latest edition of the Top Fuel moves from being a big cross country racer and becomes a short travel trail bike. With new longer and slacker geometry, plus 5mm of extra travel, it aims to give riders the efficiency they want for long days while still enabling them to ride more technical trails with confidence.

• Fully guided internal routing in the front triangle plus a 73mm BSA threaded bottom bracket simplifies maintenance for both professional and home mechanics.
• The new Top Fuel has clearance for 2.5” tires; which makes perfect sense as even XC racers are now running 2.4” tires as standard.
• The downtube storage compartment is now featured on all Top Fuel models, including the alloy versions. It’s a great feature that often gets nixed on lower priced frame models.

Price: $11,500 Weight: 26.8lbs (size XL) Style: Full suspension 120mm trail bike Frame: OCLV Mountain Carbon, internal storage, tapered head tube, Knock Block 2.0, internal guided routing, downtube guard, magnesium rocker link, Mino Link, ABP, Boost148, 120mm travel Wheel Size: 29” Fork: RockShox SID Ultimate, DebonAir spring, Charger Race Day damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 120mm travel Rear Shock: RockShox Deluxe Ultimate RCT, 185mm x 50mm Drivetrain: SRAM Eagle AXS, wireless, 12-speed Cranks: SRAM XX1 Eagle, DUB, 55mm chainline, 175mm length Chainring: 30 tooth Cassette: SRAM Eagle XG-1299, 10-52T, 12-speed Brakes: SRAM G2 Ultimate hydraulic disc, carbon levers Front Wheel: Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle Rear Wheel: Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru-axle Tires: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29.x2.40'' Saddle: Bontrager Arvada, austenite rails, 138mm width Seatpost: RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length Handlebar / Stem: Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm handlebar rise, 820mm width, 0 degree stem rise, 45mm stem length

While XC race bikes were becoming longer travel, yet another new category of mountain bikes started to gain traction with riders: down-country. This new breed of bikes combines elements of longer travel all-mountain and trail bikes (such as slack geometry, more powerful brakes, and heavier casing tires) with shorter travel and lighter-weight frames. Essentially, burly XC bikes that you can ride all day, are efficient climbers, and very capable at descending. This is the approach Trek took with the latest Top Fuel.

The new Top Fuel strikes a similar silhouette to the older model, with a vertically mounted shock layout and Trek’s Active Braking Pivot suspension system; which now delivers an extra 5mm of travel in the rear to match the 120mm travel fork. The Top Fuel’s geometry is in line with other bikes in the emerging down-country category, with the headtube angle becoming 1.5 degrees slacker and reach increasing by 10mm as compared to the previous generation of the bike. The Top Fuel now also has clearance for 2.5 inch tires, for those who want to push traction to the limit.

The new Top Fuel edges ever closer into the territory of its longer travel sibling, the Fuel EX. The updated geometry of the Top Fuel actually makes the Fuel EX look a bit dated in comparison. The two bikes have identical headtube angles, with the Top Fuel having a longer reach and a steeper seat angle as well. You can even fit a 130mm fork on the Top Fuel, which would make it slacker than the Fuel Ex. Basically, the Top Fuel is no longer a race oriented bike. It has now morphed into an efficient trail bike for riders that still want solid pedaling performance to get up the climbs, but who want additional speed, confidence, and control on the descents.

Builds & Pricing

There are a total of nine different Top Fuel builds offered by Trek, plus carbon and alloy framesets. The Top Fuel is also available through Trek’s Project One program, allowing riders to customize everything from components to paint.

We got to test the Top Fuel 9.9 XX1 AXS build, which at $11,050 is (depending on your perspective) either a reasonable price for a modern high end bicycle or completely bonkers. With bikes such as Specialized S-Works Epic EVO coming in at a cool $13,000, and the Scott Spark 900 Ultimate EVO AXS at $14,000, the Top Fuel 9.9 almost seems price conscious.

The cheapest Top Fuel model, the alloy framed Top Fuel 5, features a RockShox Recon fork, X-Fusion X-Pro2 shock, and a Shimano Deore drivetrain at $2,630. The Top Fuel 7 has a Recon Gold fork with a mix of Shimano SLX and XT parts, plus Bontrager Line Comp wheels for $3,530. The Top Fuel 8 is the priciest alloy build at $3,830, with a RockShox SID fork and Deluxe Ultimate shock plus more powerful Shimano M6120 four-piston brakes.

The Top Fuel 9.7 is the most affordable of the carbon builds at $4,230. It uses Fox Rhythm 34 fork with a Float DPS shock and is finished with a mix of Shimano SLX and XT, plus Bontrager Line wheels. The Top Fuel 9.8 has three different versions based on your component preferences. You can go mechanical with SRAM GX or Shimano XT for $7,050 or upgrade to GX AXS for $7,550. All three use RockShox SID Select+ forks and Deluxe Ultimate RCT shocks, along with Bontrager Line Elite 30 wheels. Moving to the top of the price range, for $9,550Trek offers the Top Fuel 9.9 XTR build for Shimano and Fox lovers. It uses Fox Factory level suspension, a full mechanical XTR drivetrain, and Bontrager Line Pro 30 wheels. Riders preferring Rockshox Ultimate level suspension and electronic XX1 AXS shifting will need to spend $11,050 to get the most expensive Top Fuel model, the 9.9 XX1 AXS.

If you’d rather build your bike from the frame up, Trek offers alloy and carbon framesets. The Top Fuel AL frame sells for $2,320 with a Fox Float DPS shock. The carbon frame is priced at $3,720 and includes a Fox Factory Float DPS shock.

Geometry & Fit

The new Top Fuel has received the slacker and longer treatment, and as a result, the head tube angle is now a degree and a half slacker at 66º across the entire size range. Reach grows by 10mm while BB height and chainstay length remain the same from the previous generation.

Trek offers seven different sizes of the Top Fuel, including an M/L option for riders often caught between the medium and the large. With a stock stem length of 45mm on all sizes except an XS, our 6’3 tester felt cramped on the size XL and likely would have benefited from sizing up to an XXL. The issue was resolved with a longer stem, but the most expensive 9.9 builds of the Top Fuel Trek use its integrated Bontrager RSL handlebar and stem combo. It’s easy enough to swap out as it thankfully doesn’t run any lines internally, but it still means riders will need to supply both a bar and a stem to make fit adjustments. As always, it’s highly recommended that you get a test ride in at a shop before buying a new bike if possible.

Ride Impressions

The new Top Fuel is very much a short travel trail bike meant for ripping down burly trails. Thanks to a 40mm increase in wheelbase, a slacker head tube angle, and other geometry changes over its previous version, it feels much more planted and composed on rough and fast descents. It’s a bike that wants to hold a line and stay planted on the ground. This worked well in certain situations, like scrubbing speed on a rough bit of trail heading into a turn. Other times it made me have to fight the bike a bit to make quick line adjustments.

To highlight the new trail bike character of the Top Fuel, Trek has made some component choices to suit the bike's new intended purpose. Opting for four-piston SRAM G2 brakes, as well as grippier XR4 tires, for better control on steep descents. The frame is also beefed up with a larger downtube that now includes a storage compartment for snacks or, more likely, flat-fix tools. The seat tube also grows in diameter to increase stiffness and accommodate a larger diameter 34.9mm dropper post. The remote lockout is also gone from the handlebars – which, perhaps more than any other change, makes the Top Fuel's intent as a trail bike crystal clear.

Trek’s ABP suspension design has had many years of refinement and is a genuine four-bar platform, unlike many 120mm bikes that use a flex pivot. In contrast, all the pivot points on the Top Fuel use sealed bearings, resulting in a suspension setup that feels much more active. The design does a good job of isolating braking from the suspension, resulting in less skipping and bouncing when you’re hard on the brakes in a rough section of trail.

The downside of the Top Fuel’s trail bike transformation is that it’s now a bit heavy. Our premium 9.9 XX1 AXS XL sample came in at nearly 27 lbs. This isn’t wildly heavy for a trail bike, but typically you get a bit more suspension travel with that weight penalty. For reference, the Scott Spark I tested earlier this year has the same amount of suspension travel as the Top Fuel but is a full three pounds lighter. Trek does say that the Top Fuel is compatible with a 130mm fork, and I can’t help but think the new Top Fuel would have made a lot more sense with the increased travel straight from the factory.

After having multiple testers on the Top Fuel over the last few weeks, our consensus has been that the Top Fuel would thrive in a place that has a lot of machine built or well maintained, and steep trails. Trails where you can get the Top Fuel moving fast allow the progressive all-mountain geometry to shine and make the bike feel much more capable than its 120mm of travel would suggest.

The new Top Fuel is undoubtedly more capable than its previous version while maintaining much of its pedaling efficiency. Riders with more than a casual interest in racing should probably look at bikes such as the Scott Spark , Canyon Lux Trail , or Specialized Epic EVO . The Top Fuel is perhaps the ideal bike for riders who want a trail, or even all-mountain, bike geometry experience, but don't want the extra weight or need the extra bit of travel.

Trek Top Fuel 9.9 XX1 AXS

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Trek Top Fuel 9.9 SSL review

Trek world racing’s cross-country race rig.

You can trust Cyclingnews Our experts spend countless hours testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

The Top Fuel 9.9 SSL is a replica of the bike that was ridden to victory by Trek World Racing's Mathias Flueckinger in the 2010 U23 World Cup and World Championships. It's certainly superlight, but after three months of testing, we came away somewhat disappointed. We found two issues: the rear suspension doesn’t produce the pedaling performance expected from a cutting-edge cross-country rocketship and the front end of the bike feels soft, to the point of affecting handling.

Ride & handling: Promising ride stifled by rear shock and front stiffness issues

Our first experience with Trek’s ABP suspension system came when the technology was launched in 2007 (for the 2008 model year) with the Fuel EX. That bike climbed like a champ, with a firm but active suspension platform that offered very little pedal induced shock movement or feedback. On top of great pedaling, it provided the best downhill suspension performance Trek had ever offered.

We expected a similar experience from the Top Fuel, albeit race-tuned for cross-country. Instead, we found the rear suspension disappointing. With the Fox RP2 Boost Valve shock set at Trek’s recommended 25 percent sag — roughly 150psi; about 8psi more than recommended in the setup chart — the bike wallowed and the shock sensed every pedal stroke. This made the 9.9 SSL feel sluggish and heavier than its 22.84lb (without pedals) weight.

Bumping up the spring pressure to 190psi produced good pedalling performance with ProPedal platform damping engaged but left us with just 10 percent sag, reduced usable travel by 20 percent and required us to run the rebound circuit full-closed. We also had to run the fork harder to balance the bike, resulting in the same compromises up front.

This situation wouldn't be acceptable on any bike, let alone one costing close to US$8,000. Experience with the 2009 Top Fuel suggests the suspension design is sound, so it appears to be the latest Boost Valve equipped rear shock that's caused the problem. The suspension's leverage rate appears to be overwhelming the BV controlled pedaling platform. More on this below...

The Top Fuel’s Wisconsin-made OCLV Mountain carbon fiber frame offers good pedaling stiffness, which gives kudos to the new-for-2011 full-carbon rear end . However, while the frame has been given a tapered 1-1/8 to 1-1/2in head tube and correspondingly bigger down tube this year, the front end of the complete bike lacks stiffness. This issue – which we think is largely attributable to the lightweight carbon stem and front wheel; again, more on this below – presents itself at inopportune times.

Bontrager's Race XXX Lite stem threw the performance of the front end off

Charging rock gardens at medium to high speed, the bike felt like it was bending, loading up and pushing back; in a few cases this panicked the rider and in one case it contributed to a get-off. The same sensation of flex somewhere between handlebar and tire tread could be felt when muscling the bike up steep, rocky and technical terrain in the small chainring and 36-tooth low cog, particularly when torque was applied – for example, as the front wheel fell into a hole and the rider tried to correct.

Flex could also be felt in the saddle, where the seatmast produced an annoying bounce, especially when climbing or spinning at a high cadence on dirt roads with the rear shock locked out. However, this lack of stiffness is deliberate. Michael Browne, Trek’s mountain bike brand manager, told us: “It’s by design that it has deflection. And a lot more so than the [Elite 9.9 SSL] hardtail, because it’s a suspension bike and that’s what they were trying to build into the frame.”

These issues aside, the Top Fuel handled well, with a fit and geometry that's best described as performance cross-country. It doesn’t have the super-steep head angle of the race bikes of yesteryear, but it's not progressively slack either, at 70°. Along with a 73.5° seat angle, this gives the 9.9 SSL a neutral feel. It's very well mannered on singletrack or double track in most situations.

The longish top tube (23.8in, effective, on the 18.5in size) and 100mm stem provide a fit that a Lycra-clad racer is likely to appreciate more than an all-day trail rider. The 12.9in bottom bracket isn’t too high, but also not so low that you're constantly clipping rocks with your pedals. Overall, Trek seem to have nailed the geometry on this all-out racer, and you can ride it downhill fast until you start butting up against the stiffness issues.

In fact, this is where the bike excels. When properly sagged, the downhill performance of the ABP design is up there with the best – and not just in cross-country race terms; the same platform is used on Trek's Session downhill bike. We threw it on the ground a few times (ie. crashed) without any repercussions, which speaks well for its durability, and we also think it looks darn good.

Equipment: Replica component complement offers good performance, with exception of stem

Despite our misgivings with the rear shock and front end of the Top Fuel, Trek have left no possible hiccup in the specification of this bike. A full complement of Shimano’s new M980 XTR is paired with Bontrager’s top-level XXX components including their carbon rimmed wheelset, carbon stem, RXL handlebar and Evoke 4 saddle with carbon rails. Heck, even the top cap on the Cane Creek IS-3 headset is molded from unidirectional carbon. This thing is blinged out.

The new Shimano XTR offers rougher, yet faster and more forceful shifting performance than previous editions of the top-level group. The 42/30t double crankset paired to the 11-36t cassette providing all of the range any racer will need, World Cup or otherwise. The brakes offer a major step forward in power, even in their cross-country configuration, all the while maintaining the high level of modulation that Shimano brakes are known for.

For cross-country racing, we find two-ring cranksets provide the best possible performance

The 28-spoke wheels are sexy, though we wished the front was stiffer – or 15mm axle compatible. We’ve reached the point where through-axles can be appreciated by all, even World Cup cross-country racers, and in this case the axle may have added crutch to the soft front end of the bike. Despite the carbon rims, the wheels survived occasionally being bounced off rocks and tire pressures of 25psi.

Our bike came with Maxxis CrossMark UST tires, which added considerable weight (705g each, claimed) when compared to the super-light (370g actual), super-fast-rolling 120tpi Bontrager XR0 tube-type tires that grace the production bike. Note that the proper spec tires, set up tubeless like Trek World Racing run them, will drop 670g or 1.47lb, bringing the total package to 21.37lb without pedals and likely still under 22lb with pedals — darn light for a full-suspension rig.

One last issue: replacing the rear derailleur cable requires the cranks and bottom bracket to be removed, while a rear brake line change is even more laborious, involving the additional removal of the fork and the brake line’s threaded lever attachment.

Conclusion: Parts swaps could radically change this bike, but that shouldn't be needed at $8k

A bike costing close to $8,000 should be close to perfect, not hampered by rear shock issues and a lack of front end stiffness – both of which have been confirmed by our technical editor, James Huang. Trek have produced some amazing bikes over the past few years – including the 2009 Top Fuel we reviewed – so we decided to do a bit of digging to get to the root of the problems we encountered with the 2011 bike.

After explaining our issues with the rear shock to Fox Racing Shox’s race team suspension department, we sourced two different mdoels – a Float RPL and prototype RP2 Boost Valve model with a firmer ProPedal platform. We also sent the original RP2 remote shock back for evaluation, just to make sure it was working properly, which it was.

We tested the Top Fuel 9.9 with additional Fox shocks and found the Float RL to best suit our — and the bike's — style. Note that it comes with Fox's Float RP2 Boost Valve shock

The Float RPL offered three settings – open, ProPedal and full lockout – while the prototype used different internals to limit Boost Valve bleed and offer a firmer platform. Both shocks worked better than the original RP2, but the prototype still had too light a pedalling platform, which left us with the RPL as our preferred option for the Top Fuel. Whether on its non-Boost Valve ProPedal setting or full lockout, it gave the bike reasonable manners. The 9.9 SSL wasn’t vaulted to the top of the class, but performance at least fell into an acceptable range.

Fox’s 90g handlebar remote (weight includes cable, housing and shock mounted hardware) doesn't work with the Float RPL. Considering this, and that Trek want to offer handlebar control for both front and rear suspension, we believe the bike would be best equipped with Fox’s stalwart Float RL. This shock would also make the most of the ABP design's excellent downhill performance, offering a firm locked out pedaling platform that can be remote actuated but opens fully for the downhill.

Trek World Racing appear to have also worked through this. According to Fox, while the squad use a range of rear shocks with their Top Fuels, the racers can most often be found on the Float RL. However, Michael Browne, Trek’s mountain bike brand manager, told us that, while he can see the appeal of a full lockout shock to top-level racers, the production Top Fuel is aimed more at the type of rider who "goes up to the BC Bike Race, does 100-milers or 24-hour races".  "The conception of this bike... was more about a fighting weight cross-country bike that had trail bike performance to it," he told us.

As for front end stiffness, Trek say the 2011 Top Fuel was four percent stiffer in their full frame torsion test than the 2009 model (which had alloy chainstays). That, in turn, was claimed to be 33 percent stiffer than the 2008 model. (For comparison, The 2011 Fuel EX trail frame is said to be 20 percent stiffer than the 2011 Top Fuel, and 200g heavier.) So, if the flex isn't coming from the frame – or at least not all of it – what's to blame?

The e2 head tube points in the right direction, we'd just like it to be slightly better supported.

On the recommendation of Travis Brown, mountain bike race icon turned Trek product tester, we tested the bike with a different front wheel and a trail-bike-oriented stem. The stock Bontrager RXXXL rims and stem are made from carbon fiber and skewed toward the ‘light’ side of the performance equation. “I think all of our paradigms for stiffness are changing based on [today’s] forks and axles,” said Brown. “I have that bike, but I ride it with a 15mm fork. Set up that way, I feel like that frame, torsionally, is a little better than a [Fuel] EX.”

Switching the wheel and stem separately identified that much of the flex was coming from the carbon RXXXL stem, with the rim adding a little extra vagueness on top. After changing both components, the Top Fuel fell into a more normal and comfortable stiffness range. It was still notably softer than super-stiff rivals like the new Rocky Mountain Element RSL , but in line with other cross-country race bikes.

If you're thinking of buying a 2011 Top Fuel, we think it's worth considering whether the 20 percent stiffer, 200g heavier Fuel EX might better suit your riding style.

This review first appeared on BikeRadar here .

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Most Popular

Trek Top Fuel 8 review: a progressive rather than podiuming XC machine

Trek’s top fuel delivers superlative short-travel suspension performance but it’s definitely a trail bike not an xc bike.

BikePerfect Verdict

Awesome suspension, agile swagger, grippy kit and practical frame updates build a brilliant rally bike, but high weight buries any XC aspirations

Infectiously agile and playful vibe

Superlative suspension feel

Seriously tight tracking frame

Trail tough kit

Internal storage

Too heavy for XC racing

Simple fork damper

Tight internal storage access

Yawning gap between this and the Supercaliber

Why trust BikePerfect Our cycling experts have decades of testing experience. We'll always share our unbiased opinions on bikes and gear. Find out more about how we test.

Top Fuel used to be Trek’s out-and-out best full-suspension mountain bike for racing, but with the soft-tail Supercaliber under its sponsored riders now, the Top Fuel has developed a burly rather than race character. 

The latest frame, suspension and spec changes to the 8 make the most of its short-travel agility and gripped tenacity to create a proper rally racer. Excess weight shows on climbs and acceleration though.

Design and geometry

The alloy Top Fuel frame not only has the same geometry, shock and suspension layout as its carbon counterpart but Trek’s engineers have also worked super-hard to give it the same extensive, updated feature lineup. That includes the lever-locked trapdoor into the down tube for internal storage, threaded bottom bracket shell with chain guide tabs. The Knock Block 2.0 inset now allows 72-degrees of steering lock (not 58-degrees as before) or you can fit a blank insert for full rotation if the bars aren’t slammed. 

In fact, it’s one of those bikes where we continually found ourselves riding how we always want to ride, not how we actually ride. That inevitably builds into an addictive upward spiral of confidence and insolent speed that often ended with us snapping at the heels of more expensive longer travel bikes even on really rowdy trails. Picking a larger, longer frame will settle it even more at speed, but for flow trails, it was refreshing to really rip those big Bontrager side tire lugs round on a compact, close combat chassis. Just be careful you don’t get too carried away, as however good it feels, less travel inevitably means the tires are having to cope with more impact force and we soon put a couple of splits in the rear tire despite the ‘inner strength’ casing.

When that happens the narrow neck of the storage hatch can make getting your spare tube out awkward and the high cage position means you won’t get a large bottle in either. There’s space for a 2.5in tire in the rear swingarm which pivots co-axially around the rear axle according to Trek’s ‘Active Braking Pivot’ wisdom. While it limits choice, the switch to a 34.9mm seatpost size should mean stiffer, smoother dropper action, especially on larger frame sizes which get up to a 200mm shaft stock. The new trunnion style shock pivots more smoothly and is the right way up now compared to last year’s inverted shocks. That means the MinoLink geometry flip chip to change angles by 0.5-degrees is now at the base of the shock but it’s still easy to get too. Significantly all RockShox spec Trek bikes from the 8 upwards get the same ‘Ultimate RCT’ spec Deluxe rear shock.

The alloy frame is a kilo heavier (3.74kg vs 2.7kg) than the carbon option according to Trek’s weights. This saves you $1,400/£1,500 if you buy the frame separately, although it still retails for $2,319.99/£2,350. Those numbers prove it’s neither affordable or light for a bike that you’ll find listed in the XC section of Trek's website, not the trail pages. In fact, the 130mm Fuel EX Al frame is the same weight although that doesn't have internal storage.

A 66/66.4-degree head tube definitely suggests progressive riding rather than traditional podium hunting vibes too. The 465/469mm reach on our M/L size is more trad than rad though so riders after a stretch should make use of the short 450mm seat tube and opt for the L with a 480/484 reach. All bikes get the same 76/76.4-degree seat tube angle and 434/435mm chainstay length though so while having six (S-XXL) sizes is great, the balance is definitely centered around the M - M/L - L models.

Components and build 

The Top Fuel 8 is the most expensive alloy bike, above the 7 at $3,529.99/£3,200 and the 5 at $2,629.99/£2,700 (we don’t know what 6 did to offend them but its missing from the line-up), but below the carbon-framed 9.7 at $4,229.99/£4,700.

The highlights of the package are the lightweight SID fork (albeit with the simplest Rush Damper) and Shimano XT rear mech and shifters. The Bontrager XR4 tires are some of our favorite welterweight all-rounders too. The SLX crank is a great piece with a 30T ring for easy climbing, but muscle Mary’s will find a 36T fits the frame too. You get a 150mm Trans-X dropper with a Bontrager Arvada saddle on top and 35mm diameter Bontrager Elite 45mm stem and 780mm wide bar.

Deore four-pot brakes just about do the job adequately via 180/160mm rotors but together with the wide rim tubeless Bontrager Line Comp 30 wheels they’re an obvious area where extra weight creeps in and adds up to nearly 14.5kg without pedals. 

Performance

Add that weight to chunky treaded, relatively grippy tires and however Trek categorizes the Top Fuel, the 8 clearly isn’t the best choice for charging climbs and ripping round simple XC laps. Now we’ve got rid of the people who’ll likely love the 12.2kg Trek Supercaliber for the same money, we can start talking about what the Top Fuel does do really well – and that’s riding properly rowdy.

While bikes like the Evil Following , Santa Cruz Tallboy , and Norco Optic have already established that short-travel bikes can feel awesome, the Top Fuel definitely goes into the small travel, BIG capability hall of fame. Like most of its peers, it doesn’t squander initial shock movement and can feel slightly sharp in the car park unless you drop tire pressures low. 

Once moving though it’s both amazingly fluid and connected over ruts and roots whether climbing janky tech or sucking onto stutter bump/root ripple turns or off-camber high lines. The wheel path and rear pivot position mean there’s minimal pull back through the pedals as it hoovers up chunder so you can stay on the gas without getting jacked or stalled out. While we’re always suspicious of acronyms and a 160mm rotor doesn’t generate much torque anyway, the braking performance of the ABP rear end is impressively grippy compared to the same hardware on other bikes. 

The RCT damper also has plus and minus low-speed compression settings to fine-tune support sensitivity depending on personal/terrain preferences. Even in the plus setting the mid-stroke mobility does mean you’ll want to flick into the much firmer ‘pedal’ mode if you’re stood up slow cadence churning on a climb or don’t want distracting bounce on long smooth climbs. The SID fork gets a similar firming option via the fork top lever though we rarely touched it unless we were really hanging on a road climb.

While the superlative suspension performance is definitely the heart of the Top Fuel’s ‘have a go hero’ character, the rest of the bike definitely exploits it rather than squandering it. The alloy frame might be heavy but it’s seriously stout when it comes to squaring up to the trail when things get punchy.

While the simpler Rush damper starts to get seasick and inconsistent well before the back end, the 35mm stanchions do a great job of staying on track. Shorter travel means less dive too and together with well-balanced cockpit dimensions and steering angle gives a really predictable and tenacious target lock.

Despite the hefty weight and relatively slow rear hub engagement the fact you can keep the power down or brake really late meant the Top Fuel always felt hyped to be hitting trails and tweaking lines as fast as possible. The shorter M/L size made it a proper joyride on tighter, twistier trails but you can still drive it really hard, heels down, feet level through turns and it loves to pump downslopes.

Trek’s Top Fuel 8 is a brilliant example of just how good short-travel suspension can feel, and less stroke always means a more responsive, visceral ride than a leggier bike. The geometry and proper trail tires really let you exploit the hooligan that’s hiding in the frame along with your pump, tool and spare tube too. 

As much as we’ve loved ripping around the trails on it, there’s no doubt it’s heavier and harder to accelerate/elevate than we’d like for its supposed XC/downcountry range placement though. If you’re about the overall vibe, not outright velocity, that doesn’t matter though.

Test conditions

• Temperature: -2 to 8 degrees
• Surface: Mixed blue-black trail center, moorland tracks, off-piste wooded tech and DH

Tech Specs: Trek Top Fuel 8

• Price: $3,829.99 / £3,850
• Model: Trek Top Fuel 8
• Discipline: XC/downcountry/trail
• Head angle:  66/66.4-degrees
• Frame material: Alpha Platinum Aluminium
• Weight: 14.46kg
• Wheel size: 29 x 2.4in 
• Suspension: RockShox SID 120mm travel, 44mm offset/RockShox Deluxe Ultimate RCT 120mm travel
• Drivetrain:  Shimano XT M8100 mech and shifter. Shimano SLX M7100, 10-51 cassette, chain
• Cranks:  Shimano XT 30T chainset
• Brakes:  Shimano Deore M6000 brakes with 180/160mm rotors
• Cockpit:  Bontrager Line 780mm bar and 45mm stem
• Wheelset:  Bontrager Line Comp 30 wheels
• Tires:  Bontrager XR4 Team Issue 29 x 2.4in tires
• Seatpost:  TranzX 150mm dropper post
• Saddle: Bontrager Arvada, steel rail saddle

Guy has been working on Bike Perfect since we launched in 2019. Hatched in Yorkshire he's been hardened by riding round it in all weathers since he was a kid. He spent a few years working in bike shops and warehouses before starting writing and testing for bike mags in 1996. Since then he’s written several million words about several thousand test bikes and a ridiculous amount of riding gear. To make sure he rarely sleeps and to fund his custom tandem habit, he’s also penned a handful of bike-related books and talks to a GoPro for YouTube, too.

Current rides: Cervelo ZFS-5, Forbidden Druid V2, Specialized Chisel, custom Nicolai enduro tandem, Landescape/Swallow custom gravel tandem

Height: 180cm

Weight: 69kg

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Field Test: 2020 Trek Top Fuel - The Featherweight That Packs a Powerful Punch

Cool Features

Trek Fuel EX 5 manual

manual Trek Fuel EX 5

2020 & 2021 FUEL EX

User manual

Quickstart Guide

View the manual for the Trek Fuel EX 5 here, for free. This manual comes under the category bicycles and has been rated by 1 people with an average of a 7. This manual is available in the following languages: English. Do you have a question about the Trek Fuel EX 5 or do you need help?  Ask your question here

Do you have a question about the Trek and is the answer not in the manual?

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Question and answer

The Trek Fuel EX 5 is a mountain bike designed for riders who want to tackle both uphill and downhill terrains. Its frame is made of Alpha Platinum Aluminum, which is lightweight yet strong enough to withstand rough trails. The bike features a suspension system with 130mm of travel, providing a smooth ride over bumps and obstacles. Additionally, the suspension system can be locked out for more efficient climbing. The Fuel EX 5 has a Shimano Deore drivetrain with 10 speeds, allowing for quick and easy gear changes. The brakes are also Shimano, providing reliable stopping power in all weather conditions. The bike is equipped with Bontrager wheels and tires, which have a good balance of traction and speed. The Fuel EX 5 has a dropper seatpost, which can be lowered or raised with a lever on the handlebar, allowing for quick and easy adjustment of the seat height while riding. The bike also has an adjustable stem and wide handlebars, providing a comfortable and customizable riding position. Overall, the Trek Fuel EX 5 is a versatile mountain bike designed for intermediate riders who want a reliable and responsive bike for both uphill and downhill riding.

Can't find the answer to your question in the manual? You may find the answer to your question in the FAQs about the Trek Fuel EX 5 below.

How do I remove rust from my Trek bicycle?

1. Soak the rusty part in vinegar until completely soaked through. 2. Let the vinegar work on the rust for 24 hours. 3. Remove the rust with a wire brush or aluminium foil.

How much should I exercise as an adult per week?

As an adult, it is recommended to do moderately intensive exercise for at least 2.5 hours per week. Preferably spread over several days.

How do I adjust the suspension on my Trek Fuel EX 5?

To adjust the suspension on your Trek Fuel EX 5, locate the suspension air valve on your fork and shock. Use a shock pump to add or release air pressure, following the recommended guidelines in the user manual.

How do I change gears smoothly on my Trek Fuel EX 5?

To change gears smoothly on your Trek Fuel EX 5, anticipate your shift by easing off the pedals slightly, then use the gear shifter to shift to a higher or lower gear. Keep pedaling gently while shifting to allow the chain to move smoothly between gears.

How can I fix a flat tire on my Trek Fuel EX 5?

To fix a flat tire on your Trek Fuel EX 5, start by flipping your bike upside down and removing the wheel with the flat tire. Locate the puncture or damage, patch it using a tire patch kit, or replace the inner tube if necessary. Refer to the manual for in-depth instructions on removing and reinstalling the wheel.

How do I properly clean and lubricate my Trek Fuel EX 5?

To properly clean and lubricate your Trek Fuel EX 5, use a gentle bike-specific cleaner and a soft brush or sponge to clean the frame, drivetrain, and other components. After cleaning, apply a suitable bike lubricant to the chain, derailleurs, and other moving parts. Wipe off any excess lubricant.

How can I adjust the saddle height on my Trek Fuel EX 5?

To adjust the saddle height on your Trek Fuel EX 5, use an Allen wrench to loosen the seat clamp bolt under the saddle. Raise or lower the saddle to your desired height, ensuring it is level. Tighten the seat clamp bolt securely, double-checking the height before riding.

Is the manual of the Trek Fuel EX 5 available in English?

Yes, the manual of the Trek Fuel EX 5 is available in English .

Is your question not listed? Ask your question here

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2023 Trek Top Fuel 5 Review

If you are looking for a durable and efficient mountain bike then look no further than the 2023 Trek Top Fuel 5. 

This lightweight ride offers top-level performance and durability, ideal for riders of all levels from weekend warriors to professional racers.

Mountain biking is a great way to explore nature and stay fit at the same time. If you’re an avid mountain biker, you know how important it is to have the right bike for the job.

The 2023 Trek Top Fuel 5 was designed with this in mind, offering a perfect blend of lightweight construction with reliable performance that ensures an enjoyable ride no matter where you go.

This review will analyze all aspects of the 2023 Trek Top Fuel 5 including its components, geometry and specifications as well as its performance capabilities – giving you an insight into whether or not this mountain bike is worth investing in.

In addition, we’ll look at some of the pros and cons associated with this ride so you can make an informed decision about whether or not it’s right for your riding needs.

The Trek Top Fuel 5 is a mountain bike designed to help you get the most out of your ride. 

With its stiff aluminum frame and 29” wheels, this mid-range mountain bike is perfect for all types of riding from cruising around trails to making jumps in the park. Here’s what you need to know about its performance for the 2023 model year.

The 2023 Trek Top Fuel 5 is an exceptional mountain bike that offers an exhilarating ride. This incredible bike features a durable aluminum frame that’s light and stiff, lightweight parts, and an ultra-efficient full-suspension system for an efficient power transfer on every type of terrain.

Topped off with exceptional shocks and ride-tuned components, you’ll be able to tackle even the toughest trails with ease. 

Whether its muddy single tracks or rocky mountain passes, the Trek Top Fuel 5 will offer a responsive and forgiving experience with powerful maneuverability while still providing ample control.

– Lightweight Alpha Platinum Aluminum frame delivers optimal stiffness yet remains strong and reliable.

– Cross country performance tires give you optimum traction and grip when tackling any terrain.

– X-Fusion Pro 2 rear suspension provides efficient power transfer for maximum performance with 185mm of travel

– RockShox Recon Silver RL, Solo Air front fork with 120mm of travel

– High quality Shimano hydraulic disc brakes provide maximum control over your speed on all types of surfaces.

– Shimano crankset with a 30t chainring pulling on a 10-51t cassette

The frame of the Trek Top Fuel 5 is constructed with with Trek’s Alpha Platinum Aluminum which gives it a lightweight yet stiff profile that makes it ideal for cycling both on roads and off. 

Its broader geometry also allows for increased stability and control when climbing and descending hills, which makes it well suited for intense enduro rides. Its even got a clever internal storage compartment in the downtube to store a few tools!

The Alex MD35, tubeless compatible wheels come stock with 29×2.4” Bontrager XT3 Elite or Bontrager XR4 Team Issue tires that provide plenty of traction on wet surfaces or rocky terrain. 

The tires also provide extra grip when maneuvering tight corners as well as providing support against impact bumps when tackling rougher terrains.

The 2023 model features an updated 1×12 Shimano Deore drivetrain which provides precise and reliable shifts on even very steep inclines or descents. 

It has a 30t chainring in front and 10-51t cassette at the back, giving you ample range of gears suitable for any type of terrain you may encounter on your journeys.

When it comes to suspension, the Top Fuel 5 comes with a RockShox Recon Silver RL with 120mm of travel up front and an X-Fusion Pro 2 out back with 185mm of travel enabling you to enjoy the roughest of trails. 

This setup also keeps your hands feeling comfortable throughout more intense rides as it helps reduce vibrations thanks to its dampening abilities.

In terms of brakes this model has Shimano hydraulic disc brakes that offer great stopping power in dry or wet conditions. These brakes have consistent stopping power regardless if the trail pressure changes – offering control over your riding speed in all sorts of weather or road conditions.

Bottom Line

All in all, the 2023 Trek Top Fuel 5 offers great value for money thanks to its durable construction, efficient drivetrain, sufficient braking power and reliable suspension system, making it an attractive choice amongst serious mountain bikers who aim to make every ride count without burning through their budget.

Order online and have it shipped to your local dealer for final assembly!!

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Trek Full Suspension MTB Buyer's Guide

Trek offers a wide range of full-suspension mountain bikes built to dominate the toughest terrain. Explore this comprehensive guide to Trek’s XC and enduro racers, downhill models, and versatile trail bikes.

What are Trek Full-Suspension MTBs?

Trek full-suspension mountain bikes include both a front suspension fork and rear shock for ultimate trail capabilities. Extra shock absorption not only makes the ride more comfortable, but also allows riders to have more control over large obstacles. These advantages let mountain bikers carry more speed downhill or through XC race circuits.

If your riding style frequently lands you in the steep-and-chunky, a full-suspension setup is the way to go. And if full-suspension isn’t your thing, you can browse our wide range of Trek bikes available online or in-store.

Trek Supercaliber

Highlights : Front: 100mm, Rear: 60mm, Wheels: 29”, Frame: Carbon, Style: XC

The Supercaliber’s actions speak more than words, winning both the 2021 Olympic and World Championships. This model is the gold standard of high-performance XC bikes and includes enough rear suspension without compromising on speed. The Supercaliber’s secret weapon is the innovative IsoStrut rear shock with 60mm of travel that makes this model stand out from the pack. XC racers beware— this podium-topping bike might give you superpowers..

Forget about the hardtail vs. full-suspension debate. The Supercaliber has 100mm up front and 60mm at the rear for the perfect balance between race pace and shock absorption.

Every model has a lightweight build and Straight Shot downtube to boost stiffness. Knock Block technology prevents frame damage in the event of a crash and the internal cabling stays out of the way.

Racers need to stay hydrated, too. The Supercaliber fits two water bottles in the main frame triangle so you can stay fueled during extended training sessions or long races.

Trek Top Fuel

Highlights : Front: 120mm, Rear: 120mm, Wheels: 29”, Style: XC/Trail

The Top Fuel is a short-travel 29er that hits the sweet spot between trail bike and cross-country racer. This model is ideal for riders that shred the mountain in both directions— the Top Fuel climbs better than a trail bike and outperforms standard XC machines on the rough stuff.

The lightweight full-suspension setup preserves snappy handling so you can go fast with confidence. The updated Top Fuel model is more capable on the downhills than its predecessor and has adjustable geometry via a flip chip. The latest generation comes with Knock Block 2.0 to protect the top tube in the event of a crash— now removable and with a wider turning radius.

The all-new Top Fuel has a 66° head tube angle that's 1.5° slacker than the previous generation and has 10mm more reach, a killer combo for a more stable ride at high speeds. Toggle between High and Low frame geometry settings on the go with the Mino Link.

Pair a rear shock to a standard-travel XC fork and you’ve got an all-mountain beast that stays nimble and efficient. The high anti-squat maintains snappy pedaling for great acceleration on the climbs.

Now all Top Fuel models— both alloy and carbon— come with a built-in storage solution inside the downtube to easily carry tools or snacks. Riders can use the compatible Bontrager BITS tool bag for additional organization.

Trek Fuel EX

Highlights : Front: 150mm, Rear: 140mm, Wheels: 29” (27.5” on XS/S frames), Mixed option, Frame: Carbon or aluminum, Style: Trail

One of Trek’s most popular models, the Fuel EX is a do-it-all-well trail bike that’s designed to go anywhere. The mid-length travel is plenty capable on the rough stuff and isn’t overkill on the more moderate routes. This workhorse is perfect for riders that traverse a variety of terrain and want an all-mountain companion. The Fuel EX runs 29” wheels on the larger frames and has 27.5” hoops on XS and S sizes and the carbon models come with a neat storage compartment in the downtube.

RE:aktiv is Trek’s exclusive rear shock that responds differently to pedal strokes and bumpy terrain to optimize suspension out on the trail. Select Fuel EX models come with the higher-end RE:aktiv Thru Shaft shock.

The Fuel EX comes as a 29er on larger frame sizes and runs 27.5” wheels on XS and S frames. No matter your height, there’s a tuned geometry that’s right for you.

The Active Braking Pivot retains suspension performance under braking and the Mino Link lets riders alter frame geometry with a flick of a switch. Knock Block protects the frame in the case of a crash.

Trek Remedy

Highlights : Front: 160mm, Rear: 150mm, Wheels: 27.5”, Frame: Carbon or aluminum, Style: Enduro/trail

The Remedy is your one-stop-shop when it comes to a long-travel trail bike for aggressive riding. This model is light on its feet thanks to agile 27.5” wheels so you can whip around technical terrain and smash tight corners. There’s no lack of travel here with 160mm at the front and 150mm in the back. The Remedy has similar suspension specs as the 29er Slash, but provides sharper handling that transforms any mountain into a playground. If you’ve got a soft spot for tricky descents, this bike is a sure bet.

Smaller diameter 27.5” rims keep the Remedy nimble, even on the most technical terrain. These hoops and their 2.6” rubber offer zippy handling. Enjoy a more playful feel where you can whip around the trails and take corners like a pro.

Every Remedy model is powered by a SRAM Eagle 1x12 groupset for ultimate trail performance and unprecedented compatibility if you choose to upgrade parts down the road.

Retain suspension performance while braking thanks to Trek’s ABP technology that isolates the chainstays so the rear shock doesn’t stiffen up. You’ll have more traction at those critical moments on steep descents and twisty terrain.

Highlights : Front: 160mm, Rear: 160mm, Wheels: 29”, Style: Enduro/DH

Conquer the wildest terrain with this long-travel 29er enduro bike. The Slash is built for enduro racing, but it’s fearless on the chunkier bumps and jumps of downhill parks, too. Beauty meets beast with this eye-catching MTB with its serious suspension package— 160mm of travel up front and 150mm in the rear. The lively frame is available in carbon or aluminum versions and stays damage-free thanks to Knock Block 2.0 technology.

Engineers from Trek and RockShox collaborated on the enduro-tuned rear suspension that responds to trail inputs rather than rider pedal strokes for more accurate compression on the roughest terrain.

The most recent Slash includes 10mm of extra travel front and rear and improved geometry specs to match. The frame is now longer and slacker for additional stability in steep-and-chunky terrain, even at high speeds.

Every model comes with a full-length downtube guard so riders can transport their bikes on their tailgate without worrying about scratches or frame dings. There’s also an internal frame storage compartment to hide snacks and tools.

Trek Session

Highlights : Front: 190mm (29”) or 200” (27.5”), Rear: 190mm (29”) or 200mm (27.5”), Wheels: 29” (27.5” compatible), Frame: Carbon or aluminum, Style: Downhill

Designed to point downhill, the Trek Session is a world-class 200mm travel bike with the gold medals to prove it. This purebred DH model dominates bike parks and World Cup circuits with the most advanced suspension tech on the market. The high-pivot design and idler pulley provide a smooth, efficient ride over even the gnarliest of obstacles. The Session thrives in lift-services riding areas and on big jumps. With this downhill beast at your side, you’ll smash descents in record time.

The Session’s unique design improves back wheel movement over bumps which results in significantly smoother travel, more traction, and blistering speeds downhill.

The Session comes as a 29er, but riders can swap for 27.5” rims or run a mullet setup depending on their style. The Mino Link allows for on-the-fly progressively adjustment between 20 and 25 percent.

Frame sizes are now based on reach rather than seat tube length for a more accurate representation of ride feel. Chainstay length is also customized to match frame size and achieve a balanced geometry for every rider.

Electric Full Suspension MTB

Trek e-caliber.

Highlights : Lightweight eMTB, Front: 120mm, Rear: 60mm, Wheels: 29”, Motor: Fazua, Style: eMTB Cross-country

Who said electric mountain bikes couldn’t be lightweight? The all-new Trek E-Caliber fits full-suspension and a powerful Fazua motor into a slim setup. The sleek E-Caliber provides extra watts on XC circuits so you can ride longer and close the gap to stronger riders. There are three assist modes to match any conditions and optimize battery range. Big things can come in small packages and this supercharged XC model knows no limits.

The Fazua motor delivers power in different modes to optimize performance based on the terrain and riding style. Use Breeze mode for 100W of assist and longer range, River mode for 210W of assistance, and Rocket mode for 250W of climb-conquering power.

Like the Supercaliber, this bike comes with Trek’s IsoStrut shock for 60mm of travel and pivotless seatstays for ultra-tuned suspension.

At just 4.6kg, the internal motor provides serious pace and 55Nm of torque for getting up the hardest climbs while staying lightweight. Riders can charge or customize mode settings via the FAZUA App.

Trek Powerfly FS

Highlights : Front: 120mm, Rear: 100mm, Wheels: 29” (27.5” on XS/S), Motor: Bosch, Style: eMTB Hybrid/Cross-country

The Powerfly electric mountain bike features serious horsepower and a plush suspension setup to take your adventures to the next level. The trusted Bosch-drive system delivers smooth pedal assist and takes the sting out of the steepest gradients. There’s a battery range of 5 hours on lighter terrain and 3 hours on the rough stuff. The Powerfly is also available as a hardtail for stiffer XC performance.

The Powerfly is built around a top-of-the-line Bosch motor with Nm of torque and pedal assistance up to 20 mph. This renowned drive system combines smooth acceleration with a powerful punch on the trails.

Larger Powerfly frames come with 29” wheels while XS and S sizes run 27.5” for the perfect fit no matter your height. This balanced geometry also features a curved top tube to facilitate standing over the bike.

The smart eMTB mode automatically delivers the right amount of pedal assist and riders can switch to eMTB Lite mode, too. There’s Walk Assist for easy transport off the bike or making it up ramps.

The high-capacity battery fits neatly into the downtube and is easy to remove without tools. There’s still room for a water bottle cage and it fully charges in 3-5 hours.

Trek Fuel EXe

Highlights :  Lightweight eMTB, Front: 150mm, Rear: 140mm, Wheels: 29",  Motor:  TQ 50Nm torque, Style: eMTB Trail

Highlights : Front: 160mm, Rear: 150mm, Wheels: 29”, Motor: Bosch, Style: eMTB Trail/Enduro

Go big or go home. The Trek Rail is a long-travel electric mountain bike that floats over the biggest obstacles and shoots up the climbs with ease. The plush suspension package is a gravity rider’s dream and the Bosch-drive system provides buttery smooth pedal assist. Designed with enduro riders in mind, the Rail feels at home pointing both up and down the mountain. The removable integrated battery keeps you running laps on rowdy trails all day long.

There’s 160mm of travel up front and 150mm at the rear that’s tuned for sending it downhill and pedaling up climbing sections. Its monster truck capabilities soak up the bumps for a more controlled descent.

Ready for another lap? Toggle between pedal assist modes to blast up the mountain and tackle steeper climbs than ever. There’s 85Nm of torque to conquer tough gradients and a top speed of 20 mph.

Large 29” rims come stock on every Rail model regardless of frame size.

Trek Full-Suspension MTB Size Chart

Trek full-suspension mountain bike faqs, is a mountain bike better with full suspension.

Not necessarily— full-suspension bikes are designed for harder-hitting terrain with big bumps and high-speed descents whereas hardtail models ride better on flatter terrain.

Can you ride a full suspension mountain bike on the road?

You can ride a full-suspension Trek mountain bike just about anywhere, but keep in mind that its extra weight and plush amount of travel will slow you down on the road.

Is Trek a good MTB brand?

Yes, Trek is one of the largest bike manufacturers in the world and outfits numerous professional World Tour cycling teams with their innovative bikes and components.

Is a full suspension bike good?

Full-suspension mountain bikes are great choices for riding trails with big obstacles, fast descents, or thrilling jumps. The extra shock absorption keeps the bike under control and allows riders to carry more speed over technical terrain.

• Rider Notes

2024 Trek Top Fuel 8 GX AXS T-Type

A 29″ aluminum frame full suspension trail bike with high-end components. Compare the full range

Manufacturer Price

Top Fuel 8 GX AXS T-Type

In Stock: SM, MD, MD/LG, LG, XL, & XXL

Biloxi Bicycle Works

Top Fuel 8 GX AXS T-Type - 2024, Medium

In Stock: MD

For This Bike

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Based on frame geometry and build specs.

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

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Compare the full Top Fuel model range

Jul 2023 · Alan Muldoon

Think Top Fuel, and the image of a XC race bike instantly springs to mind. But like a faded polaroid tucked into the corner for a dusty picture frame, it’s not an accurate representation of the current design. With the Fuel EX increasing in travel, the Top Fuel has been swept along in its backdraft and seen in high definition, it’s now a capable 29er trail bike with modern sizing and 120mm travel.  Trek offers the new Top Fuel in carbon and alloy options, where the Top Fuel 8 tested here is the high-end alloy build. Regardless of frame material all Top Fuels come with integrated downtube storage. And while the quick release hatch under the bottle cage isn’t big enough to cram a three course lunch into the frame, there’s enough space for a tube, multi-tool, a few snacks and a lightweight jacket.  Frame Trek always offers a comprehensive size range; and with frame options from S to XXL, with a tweener M/L option too, the Top Fuel 8 is no exception. It also has geometry adjustment, but rather than having Trek’s signature Mino Link on the seat stay pivot, the Top Fuel has a flip chip at the lower shock mount. In the low setting this gives a relatively tall 340mm BB height for a 120mm bike, which is probably the only carryover from its race-bike roots – designed to let you keep the cranks spinning, and the speed high at all times. Best down-country mountain-bike: short travel full-suspension The rest of the Top Fuel’s vital stats are on the money though, where a slack 65.6º head angle and steep 77.2º effective seat tube angle make it easy to hammer up the climbs and shred the descents.  It’s built solid too, the complete bike tipping the scales at 14.89kg. It also comes with a combined rider and bike weight limit of 136kg (300lb) so it’s clearly no wet noodle. Yes, it’s not the lightest for a 120mm bike, and not far off what you’d expect for a 150mm bike, but that’s the price you pay for integrated storage, as the alloy down tube needs reinforcing when you cut a hole in it. Thankfully, the Top Fuel 8 rides light, as there’s less travel to pull through to get the bike off the ground, so it offers a different ride experience to modern long-travel trail bikes which tend to have one eye on enduro racing.  Suspension There are no sag gradients on the 130mm travel RockShox Pike fork, which we assume is down to cost saving, but set-up is still really straightforward with a tape measure to hand. And while the Pike has a reputation for having a sporty, firmer tune, the basic RC version on the Trek felt smooth and composed in all situations. Yes, the RC damper has a very wide range of rebound adjustment, but there’s only a small range that’s actually usable, but it is enough to get the rebound just so; and that’s all …Continue reading »

Poppy, playful and efficient. Available in six frame sizes. Internal down tube storage. Mino Link flip chip allows geometry tweaks.

Needs a 180mm rear rotor. Accurate rear shock set up is crucial. A solid build so not the lightest in its class.

Read Review

May 2022 · Tom Marvin

An absolute hoot to ride on all but the gnarliest tracks, a true trail bike even if on paper it doesn’t look it

Shrugs off limited travel figures on 95% of trails

Loves to twist and turn

Fast-rolling rubber helps keep speeds high

Fork can twang under heavier riders

You’re occasionally reminded of the 120mm travel

Mar 2022 · Peter Walker

In our big 2022 downcountry group test, we pitted the Trek Top Fuel 9.9 XX1 AXS against 5 of the hottest bikes of the year. Read the full review to find out what it’s capable of and how it stacks up against the competition. Hit the link for the full review and a list with all other bikes in test.

Freedom of movement downhill

Firm and efficient rear suspension generates plenty of traction

Intuitive handling

Practical detail solutions and clean look

Very wide handlebars

Mar 2022 · Guy Kesteven

Trek’s Top Fuel delivers superlative short-travel suspension performance but it’s definitely a trail bike not an XC bike

Infectiously agile and playful vibe

Superlative suspension feel

Seriously tight tracking frame

Trail tough kit

Internal storage

Too heavy for XC racing

Simple fork damper

Tight internal storage access

Yawning gap between this and the Supercaliber

Shore Country? Dad Country? No no, this one is "fast trail"

Dec 2021 · Henry Quinney

For a bike that is so capable on the descents, though, the Top Fuel still packs a mighty punch when it comes to gaining elevation..

Great suspension performance

Frame storage

Strong climbing performance

Knockblock isn't as well executed as other brand's versions

Works well when pushing hard, but might not be the most comfortable for all

Oct 2021 · Ryan "Squirrel" LaBar

Adding fire to the Fuel

The Trek Top Fuel has been overhauled for 2022, receiving an all-new frame with integrated storage, plus key updates to the suspension design and geometry. So how does it ride on the trail? And will everyone be pleased with all the changes? Read on for our Trek Top Fuel review.

Brilliant trail-ripping geometry

Active and supportive suspension

Masses of cornering grip & stability

Refined and practical frame design

Downtube storage is a welcome addition

Dropper post is sluggish

Wheels are solid but quite heavy

Carbon bars are harsh

Heavier than many of its competitors

Last updated April 28

If you want to have the best possible time on the trail, you’ve gotta take great care of your bike. The good news is it’s not too diffcult to keep your ride in tip-top shape. In fact, we’ll teach you the basics right here and now!

Mountain bike suspension adjustment

You can adjust your mountain bike suspension pressure to match your individual rider weight. You can also adjust the firmness of your shock to match the terrain you’re riding with the blue compression damping lever. The red rebound damping knob adjusts how quickly your suspension bounces back after compressing, and it usually correlates with your air spring pressure. Learn more about how to set up mountain bike suspension with our step-by-step guide.

Mountain bike fork length

Trek full suspension mountain bikes are often compatible with slightly longer forks with more suspension travel. Installing a longer fork will give you more control on descents but will make the front wheel more likely to wander on climbs. Depending on which model fork you have, you may be able to simply install a longer air spring to get that extra suspension travel, or you might have to get a new fork. Not every frame can safely handle a longer fork, so it’s important to check your bike’s maximum fork travel listed in the specifications.

Mountain bike suspension service

Your mountain bike suspension fork and shock should have regular maintenance performed at certain intervals. This involves replacing dirty fluids and seals, as well as inspecting or replacing other internal parts that keep your suspension working like it should. Service intervals vary by suspension manufacturer. This is a service best left to experienced technicians and can be performed at your local retailer.

Watch: How to clean a mountain bike

Everything works better on your mountain bike when it’s clean—and it looks cooler, too. Learn how to clean your mountain bike for a smoother ride and shiny good looks.

Watch: How to clean a mountain bike chain

This crucial part of your bike requires a little more maintenance than a bath. Keeping your mountain bike chain clean and lubricated will go a long way toward smoother shifting and longer-lasting drivetrain parts.

Watch: Pre-ride checklist

It’s important to inspect your mountain bike after washing and before riding to make sure everything is still working as intended.

Cross country

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