What Size Seat Clamp?
11-10-10 | 09:43 PM
#1
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Joined: Oct 2010
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What Size Seat Clamp?
I just got a frame fitted for a 27.2 seatpost. I have never had a bike that has to have a seat clamp added to its frame before,
MY QUESTION IS... do i need a seat clamp that is also sized 27.2, or since the clamp is going on the frame does it need to be larger
MY QUESTION IS... do i need a seat clamp that is also sized 27.2, or since the clamp is going on the frame does it need to be larger
11-10-10 | 10:34 PM
#2
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Joined: Apr 2009
Posts: 39,897
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Seat post clamps are sized by the outside diameter of the frame's seat tube, not the seat post which is the size of of the inside diameter. They are often sold in metric sizes, but these are actually rounded off equivalents of standard inch sizes, either 1-1/8", 1-1/4", or 1-3/8" (approx 28..6, 31.8, or 35mm).
If the seat post is 27.2, odds are the seat tube is 1-1/8" if steel or 1-1/4 if aluminum or carbon, but you'd best either measure or check the spec sheet to be sure.
If the seat post is 27.2, odds are the seat tube is 1-1/8" if steel or 1-1/4 if aluminum or carbon, but you'd best either measure or check the spec sheet to be sure.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 11-10-10 at 10:37 PM.
