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"A huge increase in frame stiffness and drop in weight"
"Lower weight and increase stiffness without the inherent drawbacks of fully integrated seatposts"
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"Unlike some other systems, it doesn’t require cutting to length"
"As well as saving weight, it can flex more than in a traditional system"
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"A key element would have to be Trek’s version of the integrated seat mast"
"Trek took the extra step of making long and short seat mast tops available for personalized sizing"
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All your favorites, all in one place
Get all your favorite apparel from over 80 of the world's best cycling brands delivered right to your doorstep or local Trek retailer when you shop our curated online collection. If you're not 100% satisfied, you can return your purchase within 30 days for a full refund.
Shop all gearBorn in a barn
Get an inside look at how the company got its' name, why it decided to start it's life in a barn, and more!
Read moreGo By Bike
Planet Earth is our home and our responsibility —we must do our part to preserve it. Learn how you can join the #GoByBike movement and help make a difference in the future of our planet and all who call it home.
Read moreHow-to content
Wondering how to properly fit that new helmet you just got? Need some tips on how to ride with your kids? How about ways to be more visible to cars? We've got that and a whole bunch more!
Learn moreCulture
Trek culture is who we are, what matters to us, and what we do as a brand. Take a look behind the scenes at Trek’s global headquarters.
Read moreResponsibility
There's a lot more to Trek than making the world's best bikes and cycling gear. Learn more about everything Trek is doing to make the cycling space safer, more inclusive, plus a whole lot more fun.
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30-Day Unconditional Guarantee
If for any reason you're not satisfied with a Bontrager or Trek aftermarket purchase, return the item, along with the original sales receipt to the original place of purchase within 30 days for an exchange or refund. Think of it as a 30-day test ride.
Learn more| Size | 135mm x 5mm | 135mm x 20mm | 175mm x 5mm | 175mm x 20mm |
|---|---|---|---|---|
| Length | 135mm | 135mm | 175mm | 175mm |
| Offset | 5mm | 20mm | 5mm | 20mm |
| Rail compatibility | 7mm round | 7mm round | 7mm round | 7mm round |
| Material | Carbon | Carbon | Carbon | Carbon |
| Weight | 130g | 130g | 150g | 150g |