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Thread: new seatpost

  1. #1
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    new seatpost

    i have a specialized stumpjumper and i need a seatpost for the bike. I do not have the old one and was wondering if anyone could tell me how to measure it so i can be sure to get the correct seatpost size.

    Thanks

  2. #2
    Official Website Waterboy born2bahick's Avatar
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    Most Specailized use 30.9mm diameter. A quick call to a bike shop will check this out!

  3. #3
    Throw the stick!!!! LowCel's Avatar
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    When you pull the seatpost out it should have the size printed or stamped on the bottom.

    *oops - misread your post. Thought it said you had the post not didn't have....oops.
    I may be fat but I'm slow enough to make up for it.

  4. #4
    Throw the stick!!!! LowCel's Avatar
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    You could also give Specialized a call at (408) 779-6229.
    I may be fat but I'm slow enough to make up for it.

  5. #5
    one less horse cryptid01's Avatar
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    Quote Originally Posted by seb01003
    I do not have the old one and was wondering if anyone could tell me how to measure it so i can be sure to get the correct seatpost size.

    Thanks
    Use a vernier caliper (or similar) to measure the inside diameter of the seat tube.

  6. #6
    one less horse cryptid01's Avatar
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    Quote Originally Posted by R. Danneskj÷ld
    Measure this length of string (vernier calipers work well) and you have your seatpost size.
    Don't forget to divide by 3.14159.

  7. #7
    Fourth Degree Legend junkyard's Avatar
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    i think the answer is probably 8. don't ask questions. that takes too long and is confusing. just buy 8.
    Quote Originally Posted by dminor View Post
    The caveat with a strap-on, of course, is you will have to get creative with a couple of lock cables and an anchor point

  8. #8
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    I prefer these inside radius gauges, which you then measure with a caliper.


  9. #9
    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by seb01003
    i have a specialized stumpjumper and i need a seatpost for the bike. I do not have the old one and was wondering if anyone could tell me how to measure it so i can be sure to get the correct seatpost size.

    Thanks
    a quick confirmatory measure could probably be made holding a ruler across the the seat tube hole.

  10. #10
    Obeying Gravity
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    Quote Originally Posted by mx_599
    a quick confirmatory measure could probably be made holding a ruler across the the seat tube hole.
    True, but what if he measures 31mm. Is it a 30.6 or a 30.9, or maybe is it a 31.6? It's hard to be exact with a ruler.

  11. #11
    Senior Member taylor p's Avatar
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    Quote Originally Posted by mcoine
    I prefer these inside radius gauges, which you then measure with a caliper.

    yup much more accurate

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