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Heldring in reply to @gretsch

Are you sure the frame takes a 27? Could be that it originally was 27.2, could be due too grease/dirt buildup inside the tube or somebody clamped it too hard before you?

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gretsch in reply to @Heldring

pretty sure. 27.2 wouldn't go near it. will double check and give it all a good clean up, but assuming that isn't the issue?

it will be slipping about a cm or two over the course of 3/4 short commutes (3 miles or so each way)

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PhilDAS in reply to @gretsch

If it’s been over tightened or used with a post too small then the opening of the seat tube will indeed be too small for a 27.2 but that’s not to say that further down it isn’t.
Check the split in the tube at the back and make sure both sides of it are straight.

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