Bent middleburns?

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  • Yo. I have a set of square taper Middleburn Duos I'd really love to use. The non-drive side arm is fine but the drive side has a sort of elliptical rotation. Hard to describe, but a bit like a buckled wheel. Pedal swap and BB swap haven't solved the problem.

    Presumably it's wear on the taper (they were ridden loose briefly). Any way to know for sure the cause, and mitigate?

  • Have you checked that the spider and chainring is seated properly and not put on back to front, and with the arm in the right place?

    I had the same thing on some middleburns and it was that.

  • Cool. Will check. Thanks.

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Bent middleburns?

Posted by Avatar for DisappointingBob @DisappointingBob

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