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What size is my seat post?

Old 07-05-10, 02:50 PM
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Neuclearfusion
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What size is my seat post?

I just bought an '09 Cannondale Comfort 5 and do not like the Post Moderne seat post. I'm not sure what the seat post diameter is. It appears to be a little over 1". Can someone help me?

Last edited by Neuclearfusion; 07-06-10 at 01:24 PM.
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Old 07-05-10, 03:36 PM
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Take it out of the seat tube and read the size. I've never seen that wasn't engraved on the post.
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Old 07-05-10, 03:42 PM
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Originally Posted by Nermal
Take it out of the seat tube and read the size. I've never seen that wasn't engraved on the post.
And if for some reason it doesn't, take a measurement of it
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Old 07-05-10, 04:00 PM
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Originally Posted by CCrew
And if for some reason it doesn't, take a measurement of it
In millimeters.
You could stop by a bike shop and they'll measure it for you.
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Old 07-05-10, 04:43 PM
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Originally Posted by RonH
In millimeters.
You could stop by a bike shop and they'll measure it for you.
There are no bike shops in my hometown. It messures about 1-1/16".

Last edited by Neuclearfusion; 07-05-10 at 04:46 PM.
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Old 07-05-10, 06:43 PM
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Make sure you measure it in millimeters precisely, only size I've seen measured in inches is 7/8" or 22.2mm. Most newer bikes I've seen are 27.2, but there are sizes close enough you might not catch the difference if you don't measure it precisely, like 27.2 and 27.0.
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Old 07-06-10, 01:15 AM
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Originally Posted by Neuclearfusion
There are no bike shops in my hometown. It messures about 1-1/16".
You're going to need to be more accurate than "about."

1 1/16" comes out to 26.9875 mm. So you could be looking at a 26.8, a 27.0, or a 27.2, depending upon which side of "about" accuracy falls.

You're going to need to look at the imprint on the seatpost itself, look up your bike's specifications online, or find a vernier, dial, or digital caliper.
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Old 07-06-10, 07:17 AM
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i am riding my dads schwinn collegiate this week. had short original seatpost. 13/16 with a 5/8 top. called shop to get longer post since i have a few seats and he wanted me to bring it in. not required. i measured it with caliper myself. got a new 15" post with 7/8" top. helps to go to a shop with lots of parts. think original post is 10"?
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Old 07-06-10, 01:23 PM
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I found out that all stock Cannondale bikes have a 27.2mm seat post. Thanks
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