Join Date: Apr 2009
Location: 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
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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.
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Last edited by FBinNY; 11-10-10 at 10:37 PM.