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Trek Round Factory Overstock Carbon Seat Mast Cap

$56.00 $139.99 Model 24634
A mast cap available in two sizes and offsets for all Trek road bikes with round seat masts.
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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. One bolt head design offers easy fore-aft and infinite angle adjustment
  4. Does not include saddle clamp ears - 7mm round and 10mm oval ears sold separately
  5. Go green and save green - Zero packaging means zero waste and zero extra cost

More options


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

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