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Trek Seat Mast Cap

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$139.99 Model 11255
A mast cap available in two sizes and offsets for all Trek road bikes with round seat masts.
A mast cap available in two sizes and offsets for all Trek road bikes with round seat masts.
  • Color /
  • Diameter
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  • Offset
    Please select Offset
  • Length
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    Please select Length
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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.

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

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