27.2 Seatpost - What size FD clamp?
04-04-07, 03:44 AM
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27.2 Seatpost - What size FD clamp?
I need a clamp on front derailleur and the seatpost size is 27.2. Does it follow that the FD clamp size should be a certain size because of the 27.2 measurement? Is that too logical? Please, forgive my ignorance 
The frame is a Pinarello Angliru btw.
Thanks.
The frame is a Pinarello Angliru btw.Thanks.
04-04-07, 04:08 AM
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Probably 28.6mm but sometimes 1 measurement is worth 1,000 guesses. My son's freeride bike takes a 27.2 seatpost but it also requires a 34.9 dcrailleur clamp.
04-04-07, 04:22 AM
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Impossible to tell the FD clamp size based off the seatpost clamp... it's like asking how long the top tube is of a bike with 42cm handlebars...
04-04-07, 03:05 PM
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More than likely 32mm... The seatpost clamp on a 27.2 post is generally 32mm, and if the seattube is of a uniform diameter (probably is on an aluminum bike like the Angliru), it would match. Measure to be sure...
04-04-07, 03:08 PM
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Dial calipers are your friend. Here's the one I use. $16 is hard to beat https://www.harborfreight.com/cpi/cta...emnumber=47256
04-04-07, 03:34 PM
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I have two bike frames that use 27.2mm seatposts. The aluminum frame uses a 31.8mm FD clamp and the carbon frame uses a 34.9mm clamp.
04-04-07, 03:43 PM
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I have a 27.2mm seat post, and it uses a 31.8mm seatpost clamp. Try checking out the website of the manufacturer of the bike, its possible they have the specs.
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04-04-07, 04:14 PM
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Originally Posted by hi565
I have a 27.2mm seat post, and it uses a 31.8mm seatpost clamp. Try checking out the website of the manufacturer of the bike, its possible they have the specs.
04-04-07, 04:43 PM
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Originally Posted by Sirrobinofcoxly
+1. My carbon frame takes a 31.8 with a 27.2 seat-post. I think that's a pretty common size.
Still, I'd measure to be certain or find out from the manufacturer.
04-04-07, 04:47 PM
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Originally Posted by hi565
I have a 27.2mm seat post, and it uses a 31.8mm seatpost clamp. Try checking out the website of the manufacturer of the bike, its possible they have the specs.
04-05-07, 07:30 AM
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Originally Posted by VT to CA
Impossible to tell the FD clamp size based off the seatpost clamp... it's like asking how long the top tube is of a bike with 42cm handlebars...
Thanks all for the replies. I checked the Pinarello site and couldn't find anything. I was guessing 32mm. Is there an easy way to measure rather than those calipers?
04-05-07, 07:48 AM
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Originally Posted by FizzyPop
That is an absurd comparison!
Thanks all for the replies. I checked the Pinarello site and couldn't find anything. I was guessing 32mm. Is there an easy way to measure rather than those calipers?
Thanks all for the replies. I checked the Pinarello site and couldn't find anything. I was guessing 32mm. Is there an easy way to measure rather than those calipers?
