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  1. #1
    mtbr member
    Join Date
    Jun 2007

    how to measure seat post length

    how do you determine the length of the seat post??

    Am I suppose to measure it to the rails that holds the seat in? or to the top of the actual post?

    I have a 06 stumpy fsr and when i measured the post from bottom to the top of the post (without rails) its 10" ~250 mm. on the specialized site it says that they come with either a 350 or 400 mm seatpost. It doesnt appear to be trimmed either.

    if i measure to the rails (locking mechanism for the saddle) it measures near ly 12.5" or ~317-320 mm long.

    can anyone fill me in. there is a pretty good deal on thomsons right now. FYI diameter is 30.9mm


  2. #2
    mtbr member
    Join Date
    Oct 2004
    According to the Thomson FAQ, they measure "from the bottom of the post to centerline of the seat rails." See

  3. #3
    mtbr member
    Reputation: rompemonster's Avatar
    Join Date
    May 2010
    thanks / useful
    yours truly,

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