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Bontrager Trek Seat Mast Cap

Bontrager Trek Seat Mast Cap
  • Color: Black
  • Color: White
Please select options


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

Part Numbers

Option UPC MPN Store SKU
Black / N/A / 135mm / 20mm 601479232598 512575 SEA50509867T
White / N/A / 135mm / 20mm 601479232635 512579 SEA50793229T
White / N/A / 175mm / 20mm 601479232611 512577 SEA50208504T
White / N/A / 175mm / 5mm 601479232628 512578 SEA49394271T