Trek Seat Mast Cap
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  1. #1
    RoadBikeReview Member
    Join Date
    Feb 2013

    Trek Seat Mast Cap

    I have a Trek Domane and am trying to determine whether I have the 135mm or 175mm mast cap. Does anyone know how they are measured? Could use a little more seat height and am maxed out with what I have.

  2. #2
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
    Join Date
    Nov 2004
    Measure it. Bottom of the clamp thingy on the bottom of the post to the center of the saddle rail. If it looks like it has pretty much no offset it's the 5mm offset, if the saddle clamp is offset noticeably to the rear it's the 20mm offset. Those are the only 4 options.
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  3. #3
    RoadBikeReview Member
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    Feb 2013

  4. #4
    RoadBikeReview Member
    Reputation: Mitch@Trek's Avatar
    Join Date
    Jan 2019
    For the Domane (and Emonda), frames sized 56cm below will have a 135mm seat mast cap. Frames sized 58cm and up will have a 175mm seat mast cap.

    Sounds like a 175mm will help give you the extra height if you are using the smaller option. If you are already on the larger option, you'd need a larger frame at that point.
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