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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"
Read moreAll 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.
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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 |