My seat tube is 30.9 and the other 30.9 fits fine. However, this should be 31 mm. I wiped the paint off the first inch of the pipe trying to attach it, but couldn't install it. I also tried opening the top of the seat tube but that didn't help. I messed up the frame so I can't return it, but it needs sanding or sanding to make it fit. I would recommend that you look elsewhere if you don't know your pipe is 31mm full diameter. or more.
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