trek seatpost clamp

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Welcome to the Wolf Tooth Color Shop, where you’ll find anodized components, multi-tools, and accessories categorized by color. Select your headset, ReMote, chainring bolts, seatpost clamp, grips, multi-tools, and more from several colors that match the style of your bike.

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You're eligible for free shipping, seatpost clamp measurement and installation guide.

The best place to find the correct seatpost clamp size is on your bike manufacturer's website. Be as specific as possible when searching on the manufacturer's website or on a search engine — include the bike's year, model, material, and other key identifiers. If information can't be found, you can find the correct diameter by using a caliper on the frame. The seatpost clamp should match the diameter of the seat tube on your frame — not the diameter of the seatpost. Another method is to print our Wolf Tooth 1:1 Seatpost Measurement Guide at 100% scale. This guide was designed for both Wolf Tooth Seatpost Clamps and QR Seatpost Clamps. It includes a measuring tape as well as a size diagram that can be used with your existing seatpost clamp. Wolf Tooth machines seatpost clamps in six different sizes and nine anodized colors. Learn more about seatpost clamp measurement and installation below, or click here to shop now.  

NOTE 1: The lip of your seatpost clamp should be on top so you are comparing the largest diameter of the clamp with the circles in the Seatpost Clamp Measurement Guide . Make sure there is no tension on the clamp bolt.

NOTE 2: Frames may vary slightly from the nominal diameters due to tolerances and paint thickness. Wolf Tooth Seatpost Clamps will fit on frames with round tubing that are within +/- 0.5mm of the specified size. For example, a 34.9mm clamp will fit frames with a seat tube measuring from 34.4mm to 35.4mm in diameter.

Click Here to View the Wolf Tooth 1:1 Seatpost Clamp Measurement Guide

How to use the seatpost clamp measurement guide

1. Use calipers to measure the seat tube ( not the seatpost). The calipers show a measurement of 34.9mm, which tells us the seatpost clamp is 34.9mm.

2. Another way to measure is to print our our 1:1 Seatpost Clamp Measurement Guide . Simply print and cut out the guide's measuring tape to find the right diameter seatpost clamp for your bike.

3. Our 1:1 Seatpost Clamp Measurement Guide also features a seatpost clamp size diagram to help you find the right clamp size for your bike. This diagram works for both Wolf Tooth Seatpost Clamps and Quick Release seatpost clamps. Place your current seatpost clamp over the diagrammed circles to find your fit.

Wolf Tooth Seatpost clamp (not qr) installation

1. Gather these materials: This includes grease (or carbon paste/ copper paste if you have a carbon or titanium frame), your seatpost, a 4mm hex torque wrench, and your new Wolf Tooth Seatpost Clamp. NOTE: Here we are using carbon paste because the Otso Cycles Voytek is a carbon bike . We recommend carbon paste for carbon bikes and copper grease for titanium bikes.

2. Once you've prepped your seat tube with grease (or carbon paste in this case), you can install the seatpost clamp on your bike. Be sure to line up the slots on your frame to the slots on the clamp (if available). Some frame slots are on the front of the seat tube, others are in the back. If your frame has multiple slots, align the slot on the seatpost clamp with the center of the slots.

3. Install the Wolf Tooth Seatpost Clamp onto your frame. Ensure the clamp's inner lip is fully nested onto the seat tube. Now you're ready to install your seatpost.

4. Install your seatpost to the desired height. Using your frame and/or seatpost torque specs as a guide, set the torque with a 4mm hex torque wrench. A good rule of thumb is to never exceed 6 Nm. If you're using a carbon seatpost or dropper post, you may need to set the torque at a much lower measurement to prevent crushing/binding of materials.

Wolf Tooth Quick Release Seatpost Clamp Installation

1. Gather these materials: grease (or carbon paste if you have a carbon bike); your seatpost; a 4mm hex torque wrench, and your new Wolf Tooth QR Seatpost Clamp. NOTE: Here we are using carbon paste because the Otso Cycles Waheela C is a carbon bike .

2. Prep your seatpost. Use grease if you have a steel or aluminum seatpost and frame. If the seatpost and frame are made from carbon or titanium, do not use grease . We recommend carbon paste for carbon bikes (as pictured above) and copper grease for titanium. Before applying anything, check your seatpost and your bike manufacturer's recommendations.

3. Install the Wolf Tooth QR Seatpost Clamp onto your frame, taking care to line up the slot on your frame and the slot on the clamp (if available). Some frame slots are on the front of the seat tube, others are in the back. If your frame has multiple slots, align the slot on the seatpost clamp with the center of the slots. Ensure the inner lip of the clamp is fully nested onto the seat tube.

4. Install your seatpost to the desired height and close the clamp. Using your frame and/or seatpost torque specs as a guide, set the torque using a 4mm hex torque wrench. A good rule of thumb is to never exceed 6 Nm. The Wolf Tooth Quick Release Seatpost Clamp memorizes torque, so the torque that you set during installation will always be applied whenver the QR clamp lever is closed. If you're using a carbon seatpost or dropper post, you may need to set the torque at a much lower measurement to prevent crushing/binding of materials.

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Axiom Trekk Seat Clamp Collar for Back Rack 31.8 Black

About this item.

• Diameter: 29.8mm<br/>Diameter: 29.8mm<br/>Seat Collar Diameter: 29.8mm<br/>Seatpost Color: Black<br/>Weight: 60g

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Product Description

Bicycle Seatpost Clamp Axiom Trekk Seat Collar 29.8 Black with Rack Mnt

• Mount a rack to any bike with this lightweight adapter that adds two M5 rear threaded eyelets to the seatpost
• Perfect for retro fitting a rear rack to turn any bike into a Trekk ready machine

Product information

Technical details, additional information, looking for specific info, customer reviews.

Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.

To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.

Customers say

Customers like the appearance, quality and ease of attachment of the hardware clamp vise. For example, they mention it looks and works great, it's reliable and mounts easily. That said, opinions are mixed on fit.

AI-generated from the text of customer reviews

Customers like the appearance of the hardware clamp vise. They say it looks and works great, does its job well, and is discrete. Some mention that the design works great for a clean install and that it works perfectly to mount their rear rack.

"...worked but was big, ugly, and not very secure in my opinion, this piece is perfect . Looks good, discrete, simple, and gets the job done." Read more

"Fits perfectly and works just fine for mounting my rear rack " Read more

"An inexpensive, solid collar that does its job well without breaking the bank...." Read more

"This clamp worked perfectly to mount my rear rack ." Read more

Customers like the quality of the hardware clamp vise. They mention it has good construction, a solid collar, and is reliable. Some say the finish is quite good and that it enables reliable attachment to seat post.

"...The finish also seemed to be quite good ." Read more

"...to so this clamp solved that problem and I was able to install a heavy duty bike rack ." Read more

"...hit my frame, the second one worked but was big, ugly, and not very secure in my opinion , this piece is perfect...." Read more

Customers find the hardware clamp vise easy to attach and mount. They say it's perfect for attaching a pannier rack to a bike frame that lacks brazed-on mounts. The rack mount attachment feature works great and connects the rear rack easily.

"...and was perfect for attaching my pannier rack since my bike frame lacks the brazed-on mounts...." Read more

"I purhcased this in order to mount a seat rider on my bike. It was easy to attach and it made it possible to mount the seat. I would recommend it" Read more

"...Clamp works great at holding your seatpost in, and has the Rack Mount Attachment Feature that also works great, just need to make sure you select..." Read more

"It fit my seat tube and connected rear rack easily ." Read more

Customers have mixed opinions about the fit of the hardware clamp vise. Some mention that it fits perfectly and works just fine for mounting their rear rack, while others say that the wrong sizes don't fit on bicycles and that it may not fit perfectly initially.

" Fits perfectly and works just fine for mounting my rear rack" Read more

"...below the piece and hit my frame, the second one worked but was big , ugly, and not very secure in my opinion, this piece is perfect...." Read more

"...It seemed to slide in perfectly for my bike and enough room to tighten the seat post . The finish also seemed to be quite good." Read more

"...worked perfectly and two p-clamps on the seat stays and the rack fit perfectly ...." Read more

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• Bontrager Quick Release Seatpost Clamp

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Moskva-Class Cruisers

Separate design teams often attempt to meet a set of ship specifications with completely different, although equally valid, strategies. To fulfill the requirements issued in April 2169 for the successor (NX-223) to the Daedalus class, which was introduced at the end of the Romulan War, Prosser & Ankopitch proposed a ship with an extremely large, spherical command hull attached to a nearly vestigial engineering hull. The proposal from the Mikoyan-Tupolev-Dassault Bureau used a long narrow command hull with a minimal frontal silhouette counterbalanced by an equally long engineering hull.

The engineers at Tezuka-Republic decided that the division of ship's functions between a command/crew hull and an engineering hull was arbitrary and unnecessarily restricted design options. Therefore, rather than gathering all the specified facilities in a single hull, their design TR-223A spread them across two hulls, as in Daedalus , and segregated the SSWR-IV-C warp core to a "bustle" at the extreme aft end of the secondary hull. This bustle could be separated easily and quickly from the rest of the engineering hull in the event of a warp core breach. The now-unpowered warp nacelles would then be shed. In this way, the demands of safety would be met without warp dynamics being degraded either by an excessively large frontal silhouette or by longitudinal warp field imbalance.

Although the Ship Specifications Review Board praised Tezuka-Republic for its creative solution to the problem of admittedly contradictory requirements for extreme safety and improved warp performance, they were forced to disqualify design TR-223A for not precisely meeting contract specifications. Therefore, in October 2171, construction contract NX-223 for Starfleet's new cruiser was awarded to Prosser & Ankopitch for what would become the Wasp class .

However, almost no one was happy with the new Wasp ships. Even before the contract was awarded, voices within Starfleet and within industry had strongly criticized the specifications of April 2169. These critics charged that they would lead to a mediocre, albeit safe, fighting ship. Two separate classes were needed, not a single class that was neither a proper explorer nor a proper warship. When Wasp was finally launched in 2173, her performance during precommisioning trials clearly showed that the critics had been correct. Although the performance problems were related in part to the continuing unavailability of the more powerful Tezuka-Republic Hiryu ("Flying Dragon") mark III warp nacelles, Wasp was obviously not the ship Starfleet had hoped for.

In a second attempt to obtain a reliable and capable warship, new specifications (NX-374) were issued in September 2175, little more than a year after USS  Wasp had entered service. Adding to this sense of urgency were intelligence reports suggesting that the Romulans had either developed or otherwise acquired matter/antimatter (M/AM) reactors. This time the specifications put less emphasis upon safety. The original requirement for completely separate command and engineering hulls was eliminated; instead, any hull configuration was allowed as long as the warp core could be quickly separated from the rest of the ship. Furthermore, requirements for speed, acceleration, and maneuverability both under impulse power and under warp power were increased, as were performance levels for target acquisition, tracking, and servicing.

These new specifications were a clear, albeit belated, admission that the critics had been correct all along: one class could not be expected to serve as both an explorer and a main battleship. In fact, starship technology was not considered sufficiently mature for a single ship to adequately fulfill both mission profiles until 2245, when the Constitution -class heavy cruiser was launched. (The controversy continues even today in the wake of the problems of the Galaxy -class explorer.)

Luckily, the designers and engineers at Tezuka-Republic had not been idle since their disappointing loss of the Wasp contract in 2171. Instead, they had spent their time refining design TR-223A so that their new entry (TR-374A) was markedly superior to what had been submitted 5 years earlier. In particular, the new SSWR-V warp reactor allowed the bustle to be made smaller, lighter, and even more easily separable. Therefore, it was hardly surprising when in November 2176 Tezuka-Republic was awarded the production contract over designs from Shimata-Dominquez, Prosser & Ankopitch, Mikoyan-Tupolev Dassault, Monarch R&U, and Thornycroft/Ebisu for what was to become the Moskva class.

However, engineering prowess may not have been the only factor in Tezuka-Republic's winning of the contract. There were accusations that the delay in delivery of the Hiryu warp engines was an attempt by Tezuka-Republic to prevent Wasp from reaching her designed performance levels. While no conclusive incriminating evidence has come to light, the delivery of the long-awaited engines shortly before the scheduled launch of Moskva in December 2177 is certainly suspicious. Tezuka-Republic maintains that if their submission of 2169 had been selected, its performance would also have not have met design specifications without the Hiryu engines. However, critics charge that TR-223A was not as reliant as Wasp on the type of engine used. Furthermore, once the Wasp contract was awarded, and even after Wasp was launched, Tezuka-Republic certainly made no efforts to accelerate delivery of Hiryu.

These controversies were soon rendered moot as the new Moskva class was recognized as a significant advance in starship design. The most important new feature was Moskva's discoid primary hull. Earlier designs had chosen a spherical primary hull for reasons of economy. Simple geometric relationships dictate that a spherical hull has the smallest surface area for a given volume. Therefore, construction costs are lower and shields are more efficient. Furthermore, institutional inertia had led nearly all exploratory cruisers originating until that time from the National Aeronautics and Space Administration, the United States Astronautics Agency, the United Earth Space Probe Agency, and its successor organizations to have spherical hulls.

The designers of USS  Moskva employed a biconvex disc for several reasons. Their initial motive was to increase hull volume while minimizing both frontal and lateral silhouettes. A warship with large frontal and lateral silhouettes would be at a greater disadvantage in most tactical situations than would be a ship with an increased superior silhouette. However, the discoid hull allowed the traditional radial layout of command hulls to be retained.

More important than these tactical advantages were functional advantages. As was shown with the Wasp class, warp field geometry would have been awkward if a spherical hull with its relatively large frontal area had been used. The discoid hull was also found to channel warp field flow across its upper surface towards the bussard ram scoops of the warp nacelles. This channeling effect improved field efficiency at all power levels and speeds. As the understanding of warp field mechanics was refined, the trend towards saucer-shaped primary hulls would be intensified in later Starfleet vessels.

In most respects, the Moskva class continued design and engineering trends established in the Comet and Daedalus classes introduced at the end of the Romulan War. As in these classes, ship functions were clearly divided between a command/crew hull and an engineering/propulsion hull. The bridge was returned to its customary position atop the command hull and the shuttlecraft bay was again placed in the secondary hull. The fusion reactor was centered along the longitudinal axis of the ship, and impulse thrust ports exited immediately in front of the warp bustle detachment seam.

Weaponry was the then-standard mix of fusion-warhead missiles and lasers. New to this class was an early type of ultraphased pulse laser cannon, two of which were mounted in the chin of the primary hull. Although the on-target energy output of this new weapon approached that of early phasers, its power requirement was higher and its range was substantially less. However, subsequent refinements lead to steady improvement and, ultimately, to the development of true phasers in 2202. Although Moskva -class ships were the first to be fitted with phasers in 2204, lasers were still carried by the Moskva class and later classes until the 2220s. Finally, warp capability was supplied by the long-awaited Hiryu mark III drive units.

The first ship of the new class, USS  Moskva (NCC-374), entered service with Starfleet in April 2179. An additional 30 ships (NCC-375 to NCC-404) joined the fleet through 2183. Moskva -class ships gained immediate popularity with officers and crews. First, total laser firepower was increased some 75% over that in the preceding Wasp class. Second, because the ship's mass was more equally distributed along the longitudinal axis than in the Wasp class, Moskva was significantly more maneuverable at both sublight and warp speeds. Finally, the more warp-dynamic design allowed greater cruising and maximum speeds.

The Moskva class had an outstanding safety record. No ships were lost because of mechanical failures. However, an incident occurred aboard USS  Johannesburg in 2186 when a faulty nacelle flow monitor falsely indicated a runaway positive feedback power loop within the plasma flow governor. Believing that a catastrophic warp core explosion was imminent, Chief Engineer Roberta Bocharnikov ordered the warp nacelles and warp bustle to be separated. Although unnecessary, these maneuvers were successful in causing the separated warp core to initiate its automatic shut-down routine. The warp core, nacelles, and the rest of the ship were towed to Starbase 13, where they were successfully re-mated. Despite her supreme embarrassment, Bocharnikov oversaw the reassembly and relaunching of Johannesburg and retained her position as chief engineer.

Although most ships of the Moskva class had left front-line service by 2215, some continued to serve as auxiliaries and training vessels until the 2240s. After retirement from active duty, Moskva -class ships were used as testbeds for many emerging technologies owing to the similarities of their layouts to those of succeeding classes. USS  Moskva was the site of the first successful ship-to-surface transport of a Human being in 2206, and USS  Gato was the first ship to fire photon torpedoes in 2214. In addition, Taurus -class tugs, which entered service in 2182, and Sanford -class repair tenders, which entered service in 2185, were derived from the Moskva class and used the same primary hull and warp drive assembly.

The Moskva -class cruiser USS  Aurora (NCC-377), a participant of the Battle of Eohippus IV, is on display at the Starfleet Museum.

Standard displacement: 67,750 t

Crew complement: 160 (27 officers + 133 crew) Weapons: 8 Type VI laser turrets (8 × 1 mounts), 2 Type VII laser cannons (fixed mounts), 2 missile launchers with 36 Spartak missiles Embarked craft: 4 medium cargo/personnel shuttlecraft, 2 light personnel shuttlecraft, 5 fighter/scouts Warp drive: SSWR-V-A spherical cavity M/AM reactor with 2 Hiryu III nacelles Velocity: wf 4.0, cruise; wf 5.0, supercruise; wf 5.2, maximum Units commissioned: 31