1. Loading...

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. Direct fit on all Trek road bikes with round seat masts
  3. Colour-matched for direct compatibility
  4. One bolt head design offers easy fore-aft and infinite angle adjustment
  5. Includes 7 mm round saddle clamp ears, 10 mm ears sold separately

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
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.

Product Compare Rack

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