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new seatpost

Old 12-04-06, 02:22 PM
  #1  
seb01003
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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
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Old 12-04-06, 02:24 PM
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born2bahick
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Most Specailized use 30.9mm diameter. A quick call to a bike shop will check this out!
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Old 12-04-06, 02:42 PM
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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.
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Old 12-04-06, 02:45 PM
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You could also give Specialized a call at (408) 779-6229.
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Old 12-04-06, 02:56 PM
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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.
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Old 12-04-06, 03:15 PM
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Originally Posted by R. Danneskjöld
Measure this length of string (vernier calipers work well) and you have your seatpost size.
Don't forget to divide by 3.14159.
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Old 12-04-06, 03:44 PM
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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.
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Old 12-04-06, 03:46 PM
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I prefer these inside radius gauges, which you then measure with a caliper.

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Old 12-04-06, 04:37 PM
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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.
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Old 12-04-06, 08:52 PM
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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.
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Old 12-04-06, 09:18 PM
  #11  
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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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