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  • I don't think it should be different at different angles, so my guess is that it probably should have been 26.6 and its been over tightened with a 26.4. I had the same problem with my old Mercian (Retro de Corsa carefully stretched it with a screw driver back to the original shape).

    I'm sure it'll be fine with a 26.4 though.

    or, quite simply, the seatube could have become ovalised.

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