1. Loading...

Trek Round Seat Mast Cap

£119.99 Model 11255
A mast cap available in two sizes and offsets for all Trek road bikes with round seat masts.
Search shop availability

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.

Product details

  1. Ultra-light carbon construction
  2. One bolt head design offers easy fore-aft and infinite angle adjustment
  3. Compatible with all Trek road bikes with round seat masts
  4. Aluminium clamp

More options



Size 135mm x 5mm 135mm x 20mm 175mm x 5mm 175mm x 20mm
Length 135 mm 135 mm 175 mm 175 mm
Offset 5mm 20mm 5mm 20mm
Rail compatibility 7 mm round 7 mm round 7 mm round 7 mm round
Material Carbon Carbon Carbon Carbon
Weight 130g 130g 150g 150g

Product Compare Rack

Start comparison
United Kingdom / English
You’re looking at the United Kingdom / English Trek Bicycle website. Don’t worry. We’ve all taken a wrong turn before. View your country’s Trek Bicycle website here.