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Pro Bike: Sven Nys's Trek Boones

The biggest name in cyclo-cross has two new bikes in his armoury

One out of two isn't bad. After we featured Marianne Vos's bike before she rode it to victory in the elite women's cyclo-cross world championships , we wondered if our presence might do the same for Sven Nys in the elite men's race . Alas, it wasn't to be, even though for much of the race Nys looked to have the edge, a small mistake on the final lap allowed Zdenek Stybar to escape to his third title.

New Trek Boone carbon 'cross bike for Nys and Compton

Exclusive: Trek Boone 9 Disc first ride review

Since becoming a Trek-sponsored rider at the start of the year, there has been plenty of interest in the new Boone 'cross machine, and on his first outing, Nys won aboard the disc version. He's since almost exclusively used the cantilever model, so we were torn trying to decide which to feature here. Thanks to arriving early, and some helpful mechanics, we decided to go for two out of two, so here are both Boones to compare and contrast.

First up, the Boone 9 disc, which maintains the same frame geometry and shaping as the non-disc version, but obviously with different brakes. The frame is an obvious evolution of the excellent Domane road frame, taking the IsoSpeed fork and frame decoupler designs, and adding some tyre clearance. The fork uses a conventional looking curved shape, but continues the curve slightly forward of the dropout, which is tucked in underneath, creating a small amount of extra shock absorption and stability. The steerer tube has a 1.5" lower bearing, tapering to 1 1/8", turning inside Trek's E2 geometry head tube, which offers a less aggressive position that is ideal for cyclo-cross. Although outwardly similar, the disc bike's fork will be substantially strengthened around the calliper mounting, a weight increase possibly offset by omitting the cantilever post mounts.

The innovative IsoSpeed seat tube decoupler would be easy to overlook on this bike, but on the road, the huge amount of extra flex and comfort it generates over rough surfaces is mind-blowing, and it must surely increase the ability to continue to pedal more effectively when the ground is bumpy off-road too. Where it is a clear advantage is impossible to say, but we're sure it's no disadvantage, especially when combined with possibly the sport's finest technician.

Out back, there's no need for a brake bridge, and so the seat stays remain independent of each other until the seat tube, removing a potential clogging point. The rear disc calliper is neatly tucked in between the stays, and Trek have retained another feature that adds practicality, namely the hidden fender mounts on the fork and rear dropouts. With double bottle bosses and convertible cable routing, the Boone has potential to be as versatile as you could wish. There's also the built-in, adjustable chain catcher, sitting unobtrusively against the base of the seat tube to hopefully prevent chain jams.

But this is Nys's race bike, and he has remained with Shimano components, using the company's R785 Di2 hydraulic shifters here, matched with Dura-Ace Di2 derailleurs, and a Dura-Ace chainset with 39/46 rings spinning in a BB90 bottom bracket and turning an 11-28T cassette. The workmanlike setup is completed with some Shimano M980 pedals, which, like those of other riders we've seen, appear to have had some of the surface coating lightly filed or sanded away, leaving a shiny, bare finish. Whether this is to gain some extra mud clearance, no one would let on.

Bontrager continue their relationship with DT Swiss, with the disc version of the Aeolus 3. The shiny, polished hubs bear no branding, but closely resemble other DT Swiss units, and are designed with 24 holes front and rear, which is a minimum requirement for disc brakes, and while laced two cross at the back, the front wheel uses radial spokes on the non-disc side. The Bontrager tubular carbon rims are 35mm in depth, and wider than average, with external nipples for ease of maintenance.

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Tyre choice for the world championships was simplified following Saturday morning's rain, as even though the course did dry considerably, the sections that were still wet and muddy were too sticky and deeply rutted through soft mud for anything other than a mud tyre. Nys had these brand new customised 33mm Dugast Rhinos with rainbow stripes and his name on the sidewall, which his mechanic estimated he'd race at 1.35 bar front and rear - that's 19.5psi - for a 71kg rider.

Bontrager supply the finishing kit, a 120mm XXX aluminium stem clamping the 44cm RXL IsoZone carbon bars, which have gel strips recessed in to them under the main hand holds for increased vibration reduction, along with Bontrager's cork tape, applied in green and black to match the colours on each side of the front end. The seat post is Trek's Ride Tuned seatmast, which cleverly avoids the need for cutting by having an externally sliding post slotted over the frame's extended seat tube. It's available in different lengths, with the added bonus of sealing the seat tube against dirt ingress, and clamps Nys's preferred carbon-railed Bontrager Serano RXL saddle.

This 56cm bike is no sized down special, but a well-fitted tool for a job, so we were impressed by a total weight, as pictured, of 7.75kg / 17.08lb (56cm), which compares very favourably with Marianne Vos's much smaller bike with a nearly identical drivetrain. Even though the disc bike has been raced less, the fact that it's here, and Nys has it in his arsenal is a sign of things to come.

Boone 9 cantilever

As expected, Sven chose to race the cantilever version of the Boone 9 for the Worlds, bringing three of them along with two disc versions, and a whole lot of wheels and tyres! The cantilever bike is outwardly very similar, sharing the frame geometry, but dispensing with the disc calliper mounts and necessary frame reinforcements they require. It also gains a fork crown mounted front brake cable hanger, which should prevent fork judder under braking, and at the back there's a bridge to brace the stays against the braking force, and a cable hanger mounted above that, but the universal cable routing is the same.

Shimano's CX70 cantlievers have great adjustment and an attractive minimal design, and are controlled by Dura-Ace Di2 levers, keeping identical shifting across the bikes. The drivetrain too is understandably identical, with the same chainset, mechs, cassette and pedals, although the chains were a CN9000 on the canti bike, and a Dura-Ace ON9000 on the disc machine.

The wheels have similar looking Bontrager carbon tubular rims, but with a braking track included, and 24 holes at the rear and 18 up front. These are laced in a more common pattern, radial at the front, and two cross on the rear drive side, with radial spokes on the other. Hubs are DT Swiss Aeolus, with straight pull bladed white DT Swiss spokes holding it all together. Tyre choice was Dugast Rhino again.

Identical Bontrager finishing kit tops the bike off, although the Ride Tuned seatmast fitted on this bike is 40mm shorter than that on the disc bike we measured. There is sufficient adjustment there that it doesn't matter, and all it means is more of the seat post is exposed. Whether the white Serano saddle was fitted deliberately to differentiate between disc and canti bikes in a hurry, we can't be sure, and although this frame doesn't feature the world champion's rainbow bands, as the disc bike does, at least one of the canti bikes he raced did.

Regarding the performance of the Boone, Nys finds it far more stable generally, and more predictable in the corners than his old Colnago. Where before his front hub was hidden behind the handlebars when he was in the saddle, now he can see it ahead of them, suggesting that the 72 degree head angle is more relaxed, and the 102cm wheelbase longer than his previous machines.

It was no surprise to find that the cantilever-equipped bike was lighter, at just 7.17kg / 15.8lb, which is very impressive when allowing for Di2, pedals and mud tyres, meaning a sub 7kg weight would easily be achievable. Nys had stated before coming to Trek that the added weight of his disc bike was still too much, but now the difference is under 600g, and will decrease in time, it will be interesting to see what happens throughout the next season. What are the chances of a Belgian Champion themed bike, now the world title has escaped?

Sven Nys's Trek Boone 9 Disc Frame: Trek Boone 9 disc Fork: Trek IsoSpeed Cross carbon disc, E2 Headset: Cane Creek Stem: Bontrager XXX 120mm Handlebar: Bontrager RXL Isozone 44mm, 125mm drop, 85mm reach Tape: Bontrager cork, black and green Front brake: Shimano BR-R785 hydraulic caliper, RT99-SS 140mm rotor Rear brake: Shimano BR-R785 hydraulic caliper, RT99-SS 140mm rotor Brake levers: Shimano ST-R785 Di2 hydraulic Front mech: Shimano Dura-Ace Di2 9070 Rear mech: Shimano Dura-Ace Di2 9070 Shift levers: Shimano ST-R785 Di2 hydraulic Cassette: Shimano Dura-Ace 6900 11-28 11 speed Chain: Shimano Dura-Ace HG ON9000 11 speed Crankset: Shimano Dura-Ace 9000, 172.5mm cranks with 39/46 rings Bottom bracket: Shimano BB90 Pedals: Shimano PD M980 Rims: Bontrager Aeolus 3, 24 hole Front hub: DT Swiss disc Rear hub: DT Swiss disc Spokes: DT Swiss straight pull, white Front tyre: Dugast Rhino 33mm 1.35 bar Rear tye: Dugast Rhino 33mm 1.35 bar Saddle: Bontrager Serano RXL with carbon rails Seatpost: Trek Boone Ride Tuned carbon post

Critical measurements Height: 1.82m / 5'11 1/2" Weight: 71kg / 156.5lb Saddle height BB centre to top: 765mm Saddle setback: 60mm Seat tube centre to top: 533mm Seat tube centre to centre: 510mm Saddle to bar centre: 572mm Saddle to bar drop: 105mm Head tube length: 157mm Top tube length: 558mm actual Total weight: 7.75kg / 17.08lb

Sven Nys's Trek Boone 9 cantilever Frame: Trek Boone 9 Fork: Trek Boone 9 Headset: Cane Creek Stem: Bontrager XXX 120mm Handlebar: Bontrager RXL Isozone 44mm, 125mm drop, 85mm reach Tape: Bontrager cork, black and green Front brake: Shimano CX70 Rear brake: Shimano CX70 Brake levers: Shimano Dura-Ace Di2 9070 Front mech: Shimano Dura-Ace Di2 9070 Rear mech: Shimano Dura-Ace Di2 9070 Shift levers: Shimano Dura-Ace Di2 9070 Cassette: Shimano Dura-Ace 6900 11-28 11 speed Chain: Shimano Dura-Ace HG CN9000 11 speed Crankset: Shimano Dura-Ace 9000, 172.5mm cranks with 39/46 rings Bottom bracket: Shimano BB90 Pedals: Shimano PD M980 Rims: Bontrager Aeolus 3, 24 hole rear, 18 hole front Front hub: DT Swiss Aeolus Rear hub: DT Swiss Aeolus Spokes: DT Swiss straight pull, white Front tyre: Dugast Rhino 33mm 1.35 bar Rear tye: Dugast Rhino 33mm 1.35 bar Saddle: Bontrager Serano RXL with carbon rails Seatpost: Trek Boone Ride Tuned carbon post

Critical measurements Height: 1.82m / 5'11 1/2" Weight: 71kg / 156.5lb Saddle height BB centre to top: 765mm Saddle setback: 60mm Seat tube centre to top: 533mm Seat tube centre to centre: 510mm Saddle to bar centre: 572mm Saddle to bar drop: 105mm Head tube length: 157mm Top tube length: 558mm actual Total weight: 7.17kg / 15.8lb

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Trek Boone Sizing issue. Ideas?

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I'm 6'3" with roughly a 34" inseam. My seat height on a 60cm Trek Domane road bike is right around 84-84.5cm. Trek Boone sizing goes from a 58cm to a 61cm and the issue I'm finding is the maximum seat mast height on the 58 maxes out at ~83cm. If I was going to be racing cross I don't think i'd find this 1.5-2cm lower seat a major issue, but I want this to be a do it all bike and will be doing some road rides (not races) on it. My reach on the 58cm felt great with a 100mm stem, although I have ~5 fingers of drop, more than I'm used too. I would be pleased with the additional headtube height on the 61cm but am worried it will stretch me too far out, and I'll have to put a short stem on it to adjust accordingly. I'm curious if anyone else has run into this issue on this bike or has some suggestions. I'm struggling with three options: A) Get a 58 Boone, and work with the lower seat mast, possibly need to raise the stem to 17degree, but like the extra standover and better top tube length. B) Go to a 61cm Boone, with much more adjustment on the seat mast, and hope I can pull the reach back far enough, and the standover isn't too high. (2.7cm, ~1inch, higher on the 61). C) Go with an aluminum frame Trek Crockett in a 58 which uses a traditional seat post which can be raised to my exact seat height, and possibly need to raise the stem a little to decrease drop. Note: This will be my first cross bike, and I understand the geometry differences between cross and road, but, I think cross will be perfect for what I'm planning on doing with it, thus I want to make this work. (Commuter, road ride, adventure rides on fireroads, getting into bike packing with specific frame bags). Thanks for any input.  

If it were me, I'd never want to deal with a seat height that's 1-1.5cm too low. My seat height is the same on all of my bikes whether I'm racing an endurance race on the MTB, road riding, or CXing. IMHO, the 58cm Boone is too small for you.  

go aluminum. cheaper and fits better. Plus if you race cross you know its going to hit the deck(likely multiple times).  

I was in the same boat. 6'3 I have 84.5mm seat height. ended up with the 61, and was happy. I run a fair amount of bar drop on my cx bike, so ended up needing a lower head set cover and have the stem at -6 on the cover. I have all my contact points set up the same (minus bringing the bard up 1.5cm, the reason I purchased the new frameset) between the new Trek and my old bike, but the trek seems to ride a bit shorter feeling... probably due to my taller setup.  

p.s. max seat height is to the rails AFAIK, and you can get a longer seat topper. I emailed Lennord Zinn and he answered my question in his column. I think it will be helpful Technical FAQ: Bike-fitting advice from some of the top names in the field | Cycling News non-stop  

I have the same height, same inseam, and a 60cm Trek Madone I'm comparing against. I have a 61cm Boone on order that I hope fits right, and I know I'm going to need a relatively short-ish stem and a low-seatback seat cap.  

I'm a little shoreter than you but not by much. I have the same issue with many frames, where the jump goes from a too-small 58 to a too large 60+. Did you look at sizing on the Kona bikes or Redline? They both seem to be right where I want. Also, a Stevens in a 60 might be right w/ a 58.8 top tube? If the Trek isn't right, to heck with it, there are some better options for a tall rider. Me personally I'd fit great on the 59 size Kona and there are two larger sizes above that.  

FYI, at least for the Domane and Madone, there is a longer seat mast available. The stock one is typically 135mm and the longer one is 175mm. I'm assuming it's the same one that the Boone uses. I personally would buy this Boone on eBay whether it fits or not ... I love the green color :-D  

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On a Domane the stock mast is 175 and the 135 is an option or on a women's model it standard, don't know about the Boone though Another option is to get a saddle that has a bigger difference between top of the saddle to the bottom of the rails - The Cobb Randee as an example is almost 1.5 CM taller than a Selle Italia saddle and I think the ISMs are taller as well. These would put the saddle height the same as you are used to using a 58 size frame. There's probably others that are taller as well, those are just the ones I have some experience with. You might be able to move the saddle a little further back to add a little more distance to the crank for you also.  

I see the original post is from 2014, so I doubt the OP cares any more one way or the other, but the seat mast on my 2014 Domane 5.2, 56 cm, is 135mm (I just measured it).  

interesting, I've had 2 Domane frames and both were 175 - 58cm. Had the shop swap for a 135 which had to be ordered both times.  

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Trek Boone 5 Disc review

High-end suspension frame, tubeless wheels, excellent hydraulic brakes

Ben Delaney / Immediate Media

Ben Delaney

The revelation of last season, the Boone , incorporates Trek ’s IsoSpeed Decoupler, the pivot point at the junction of the seat tube, top tube and seatstays that allows the seat tube to flex more freely. Besides more comfort, what this means is the ability to stay seated and pedal efficiently more often on a rough course.

The Boone 5 Disc brings this bump-absorbing design to a more attainable price, with hydraulic Shimano 105 and in-house Bontrager components and tubeless-ready wheels equipping the full carbon frameset.

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It’s difficult to overstate how drastically the IsoSpeed Decoupler flattens choppy sections of a course. While your tires are still doing the lion’s share of the work keeping traction, the frame’s ability to suspend your body keeps the engine better engaged.

Related: The best cyclocross bikes

While the Decoupler makes for a great visual talking point, the fork is perhaps the more impressive engineering feat, as the long forward sweep takes the edge off but the tucked-back dropout placement keeps the geometry in check.

As a roadie who can race like a bit of a squirrel (hello, course tape!), I found the Boone 5 Disc to be an effective sedative that often made me faster because I could focus more on steady pedaling and less on reacting to being rattled around.

Complementing the smooth-is-fast damping is the bike’s geometry, with a low bottom bracket (68mm drop) keeping your center of gravity down in the bike.

The IsoSpeed Decoupler allows the entire seatmast and seat tube to flex as one big bow

Trek’s attention to detail on this bike is readily apparent, with smartly designed internal routing, an über-wide BB90 bottom bracket, an integrated chain keeper, a gel-padded chain protector, and a 15mm front thru-axle that ensures your disc won’t rub, no matter how many times you smash your front wheel against that barrier.

The top tube sits a little lower than an old-school horizontal tube and dives toward the back, but dismounts at speed with a hand on the top tube are still very stable.

The seatmast has a 10cm range of seat height. Our 56cm tester, for instance, has a 71-81cm saddle height range. With a little carbon paste the seatmast hasn’t budget, despite being subjected to scores of poorly executed remounts.

One huge highlight of this bike is that tubeless-ready wheels come as standard. Most bikes at this price point come with clinchers. However, the tires specced are standard clinchers, meaning you have to pony up for the rim strips and tubeless tires. Aside from the tubeless capability that makes the bike more race ready than its innertube-equipped friends, the Bontrager TLR wheels aren’t impressive – they’re heavy and I easily knocked the rear out of true in the first race.

Tubeless-ready wheels? Sweet! Now, come on, Trek, and seal the deal (or give us a deal on the seal?) with tubeless tires instead of clinchers

The hydraulic Shimano brakes are excellent, offering all the power and modulation you could possibly need. Coming from cantilever brakes in dry conditions, the huge difference is laughable. And in wet conditions, comparing them to cantilevers is like comparing air travel to walking; it’s not really fair.

Hydraulic brakes do add a bit of weight, of course, mostly in the rotors, calipers and levers, as the lines themselves are lighter than steel cables. Combined with the piggish wheels, the bike on the whole is on the heavier side at 19.42lb / 8.81kg. For me, the weight penalty of discs is a price I am happy to pay in cyclocross. For road bikes, I love the feel of discs but I still lean towards rim brakes (the bikes and wheels are lighter, I want to swap wheels with what I have in my garage, and so on.). But for cyclocross, it's no longer a question: discs are a huge advantage over the noise-makers parading as cantilever ‘brakes’. There's no going back for me.

Bottom line: you can’t really go wrong with the Boone 5 Disc frameset, Shimano hydraulic brakes and, for the price, the Shimano 105 group. The wheels, while generally unimpressive, are tubeless-ready and therefore just about ready to race right out of the box.

The entire seat tube and seat mast pivots here at the IsoSpeed Decoupler

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Trek seat mast - can’t adjust seat angle

Thank you so much @mcneese.chad !!!