• Will grab a picture of the front chainring tomorrow, thanks both for the input! How do I check for stiff links? I could try running it free for a bit (reluctantly) but I can’t replicate the issue even if it’s fixed, and it’s occurred about once every two weeks or so with daily commutes to multiple places?

    The cranks definitely did lock up momentarily, hence coming unclipped each time, but given it’s fixed presumably that would have happened regardless of whether it’s the wheel or the chainring locking up?

  • To check for stiff links derail the chain and then use your fingers to try to bend every link in turn, see if any are stiff.

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