• Dirt on the spindle/crank interface or bb cartridge/shell with dirty threads?

    Or any of the above and associated bolts not torqued enough?

    Do you have a quick link in the chain? A slightly bent link plate causes me weeks of WTFs.

  • This isn't a squeak, rattle or intermittent noise - it's a sustained grinding from the cog.

    I can see the rollers pinging off the teeth and making a small noise if I do it slowly enough.

    But I take your points on board.

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