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  • ...I doubt it has anything to do with BB or chainring as your ratio would spread the uneven chaintension/wear across the cog.

    How does that work?

    My beater/commuter has quite uneven chain tension. The frame is straight, the wheel is in the frame straight. The chainring is of good quality (it's a TA ring).

    I put it down to perhaps the very cheap (£35 new) cranks and the spider being a bit off.

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