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  • Sounds like the cranks are on their way out. Once the crank has loosened and been ridden on - the square taper will deform more and more and as a result will start slipping again in short space of time. Take this opportunity to upgrade to Hollowtech II?

  • Hmm.

    Well the crank arm seems solid on the BB, just the bolt is loosening. The BB probably needs to to be replaced as well.

    Upgrading the cranks and BB isn’t on the horizon right now.

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