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> Bicycling Catalog > Parts > Seatposts > Trek > Seat Mast Cap
Trek Seat Mast Cap


Seat Mast Cap

Model # (11255)
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Trek Seat Mast Cap

Trek-compatible seat mast cap

Offered in white and black and a variety of lengths and offsets, the mast cap includes hardware compatible with round saddle rails only. 7x10mm carbon rail-compatible hardware sold separately.

Key features:

- Ultra-light carbon construction
- One bolt head design offers easy fore-aft and infinite angle adjustment
- Compatible with all Trek road bikes with round seat masts
- 175mm and 135mm lengths
- 5mm and 20mm offsets
- Aluminum clamp



by PowerReviews
Option Barcode Manufacturer's Part Number Vendor Number Store SKU
Black / N/A / 135mm / 5mm 601479788811 559540 TRK-559540 SEA43808881K
Black / N/A / 175mm / 20mm 601479788798 559539 TRK-559539 SEA44611105K
Black / N/A / 175mm / 5mm 601479788804 559541 TRK-559541 SEA43495518K
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