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  1. #1
    Über Member Ryleeryno's Avatar
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    2005 Trek 5000 (the last OCLV)
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    Seatpost collar question.

    I need to replace the seatpost collar on my 2005 Trek which has a 27.2mm seatpost and I don't know what size collar to get. Do the collar sizes reflect on the outer diamater of the seatpost or the clamping area of the post instead?

    For instance. I'm getting a Felt F3c frame which utilizes a 27.2mm seatpost also. Are the collars interchangable or are they frame specific?

    Any advice would be appreciated. Thanks.

  2. #2
    Svr
    Svr is offline
    Senior Member Svr's Avatar
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    Dec 2005
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    You need to measure the outside diameter of the seat tube where the collar (or clamp) sits. There are several different sizes. The two most common sizes these days are 1 1/4" (31.8mm) and 1 3/8" (35mm).

    The seatpost size has nothing to do with seatpost clamp size.

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