I read answers by the seller that the 31.8 should fit a 27mm seat post and that is accurate for me. It is a snug fit onto the frame tube but tightens down beautifully. Now both my taller son and I can use the bike without a lot of trouble. I'm not an avid cyclist but can't see why spending more than $10 for a quick release seat clamp would be worthwhile. I like the titanium color also.
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