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Old 04-19-06, 08:14 AM   #1
shokhead
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seatpost clamp

If my seatpost is a 27.2 then would i use a 28.6 seatpost clamp?
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Old 04-19-06, 10:45 AM   #2
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I'm not sure, but when I worked at a shop, we just had a big box full, and we test fitted them until we got a match.
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Old 04-19-06, 11:24 AM   #3
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You use a seatpost clamp that is sized to the seat tube, not the seat post.
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Old 04-19-06, 02:35 PM   #4
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Quote:
Originally Posted by supcom
You use a seatpost clamp that is sized to the seat tube, not the seat post.
Spucom's right, but the OP's size diff sounds about right.
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Old 04-19-06, 02:44 PM   #5
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Quote:
Originally Posted by FarHorizon
Spucom's right, but the OP's size diff sounds about right.
That depends on the frame/material. My OCLV takes a 27.2 post and a 35mm clamp.
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Old 04-19-06, 02:46 PM   #6
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I have two bike with 27.2 posts and they have different clamp sizes. One is a 30mm and one is a 31.6, I believe. Best to measure it or take to your LBS.
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Old 04-19-06, 02:46 PM   #7
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I have two bikes with 27.2mm seatposts and 31.8mm seat collars.

What kind of bike is it? Manufacturer's website might have the info.

Also, if you have a clamp-on front derailleur, the answer to your question might be stamped on the inside of the front derailleur clamp.
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Old 04-19-06, 02:50 PM   #8
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The clamp-on derailleur thing may be wrong, too. My Cross-check has a seat tube that is tapered/butted on the outside. It has a 27.2 post, a 30mm clamp, and a 28.6 derailleur.
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Old 04-19-06, 04:44 PM   #9
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Quote:
Originally Posted by same time
I have two bikes with 27.2mm seatposts and 31.8mm seat collars.

What kind of bike is it? Manufacturer's website might have the info.

Also, if you have a clamp-on front derailleur, the answer to your question might be stamped on the inside of the front derailleur clamp.
05 Roubaix but it doesnt list the size.
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Old 04-20-06, 07:47 AM   #10
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Quote:
Originally Posted by shokhead
05 Roubaix but it doesnt list the size.
It does list the front derailleur clamp size as 31.8, though. I'd bet that's your seat clamp diameter, too. Take it to a shop or email specialized to be sure.

edit: Hey, it's not one of those teardrop shaped seat tubes, is it? Those take a special clamp from Specialized.

Last edited by same time; 04-20-06 at 08:36 AM. Reason: and anudda thing
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