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