Product Description
The Bontrager Carbon Seatmast Cap is a genuine Trek replacement component designed for compatible Trek road bikes using Trek’s seatmast system.
Constructed from lightweight carbon fiber, the cap provides a clean, secure saddle mounting solution with multiple length and setback options to help dial in saddle height and riding position.
This multi-variation listing includes 135mm and 175mm lengths with either 5mm or 20mm offset, depending on the selected option.
Available Variations
| Seatmast Cap Size |
Length |
Offset |
Claimed Weight |
| 135mm x 20mm |
135mm |
20mm |
130g |
| 175mm x 20mm |
175mm |
20mm |
150g |
| 175mm x 5mm |
175mm |
5mm |
150g |
Key Features
- Genuine Trek / Bontrager replacement seatmast cap
- Lightweight carbon construction
- Multiple length and offset options
- Single-bolt saddle adjustment design
- Allows saddle angle and fore/aft positioning adjustment
- Designed for compatible Trek seatmast-equipped road frames
- Clean OEM replacement for damaged, missing, or differently sized seatmast caps
Specifications
- Brand: Bontrager / Trek
- Product Type: Seatmast Cap
- Material: Carbon Fiber
- Length Options: 135mm / 175mm
- Offset Options: 5mm / 20mm
- Saddle Adjustment: Single Bolt
- Recommended Torque: 6-8 Nm
- Rail Clamp Hardware: Not Included
Compatibility
Designed for compatible Trek seatmast-equipped road bikes, including applicable:
- Trek Domane SL / SLR, approximately 2012-2019
- Trek Émonda SL / SLR
- Trek Madone 5 / 6 / 7 Series, approximately 2010-2015
Compatibility can vary by model year, frame generation, and required saddle-rail clamp hardware. Confirm your existing seatmast dimensions and required offset before ordering.
Important Hardware Note
This listing is for the carbon seatmast cap only. SOLD HERE
Rotary saddle clamp / head hardware is not included. Existing compatible clamp hardware may be transferred over, or the correct Trek hardware can be sourced separately if needed.
Included
- One Bontrager carbon seatmast cap in the selected size
Not Included
- Rotary head / saddle clamp hardware
- Saddle rail ears
- Saddle
- Additional installation hardware unless pictured
Condition
