Product Description
The Trek Domane Gen 3 Carbon Internal Seatmast Cap is a lightweight, color-matched replacement for compatible Trek Domane SL, Domane SLR, and select Domane+ models using the Gen 3 internal seatmast system.
Ultra-light carbon construction maintains the clean appearance and performance of the original setup, while multiple length and offset options allow riders to match their original seatmast or achieve the required saddle position.
This multi-variation listing includes all four length and offset combinations in Gloss Voodoo White. Please select the exact configuration required for your bicycle.
Key Features
- Genuine Trek replacement seatmast cap
- Designed for compatible Gen 3 Domane internal seatmast systems
- Ultra-light carbon construction
- Available in 155mm and 200mm lengths
- Available with 5mm and 20mm offset
- Color-matched Gloss Voodoo White finish
- Interchangeable saddle rail clamp-ear system
- New and retail packaged
Variation Options
- 155mm Length / 5mm Offset
- 155mm Length / 20mm Offset
- 200mm Length / 5mm Offset
- 200mm Length / 20mm Offset
Specifications
- Brand: Trek
- Product Type: Carbon Internal Seatmast Cap
- Frame Platform: Domane Gen 3
- Length Options: 155mm / 200mm
- Offset Options: 5mm / 20mm
- Material: Carbon
- Color: Gloss Voodoo White
- Finish: Gloss
- Saddle Rail Clamp System: Interchangeable clamp ears sold separately
Choosing the Correct Size
155mm vs. 200mm Length
- The 155mm option provides a shorter saddle-height range
- The 200mm option provides additional height for riders requiring a taller saddle position
- Match the original seatmast length whenever possible
5mm vs. 20mm Offset
- The 5mm offset places the saddle farther forward
- The 20mm offset provides additional saddle setback
- Match the original offset or the requirements of the rider’s bike fit
Changing the length or offset can affect saddle height and rider position. Do not select the seatmast solely by frame size.
Compatibility
Designed for compatible bicycles using the Trek Domane Gen 3 internal seatmast system, including applicable:
- Trek Domane SL Gen 3
- Trek Domane SLR Gen 3
- Select Trek Domane+ electric road bikes using the same seatmast interface
This is not a universal seatpost. It should not be assumed compatible with earlier Domane generations, Domane Gen 4, or every Domane+ model.
Please confirm:
- Bicycle model and model year
- Gen 3 frame platform
- Original seatmast shape and interface
- Required 155mm or 200mm length
- Required 5mm or 20mm offset
- Gloss Voodoo White color
- Saddle rail clamp-ear requirements
For Domane+ e-bikes, verify compatibility using the bicycle serial number or Trek replacement part number before ordering.
Saddle Rail Compatibility
Saddle rail clamp ears are sold separately.
Compatible clamp ears are available for applicable:
- 7x7mm round saddle rails
- 10mm oval saddle rails
The correct clamp ears must match the saddle’s rail dimensions. Existing clamp ears may be reused only when compatible and undamaged.
Included
- One Trek Domane carbon internal seatmast cap in the selected length and offset
- Gloss Voodoo White finish
- Retail packaging
- Includes only what is pictured and described
Warranty and Notes
- Genuine Trek replacement component
- This is a multi-variation listing
- Select the correct length and offset before ordering
- Saddle rail clamp ears are not included
- Use carbon assembly compound and Trek-specified torque procedures
- Professional installation and bike-fit adjustment are recommended
Condition
- New
- Retail packaged
- Genuine Trek product
- Includes only what is pictured and described
