I'm pretty sure it's the pads, not sure what else it could be but open to suggestions as to some other cause.
Tyre squirm, glove squirm (if leather), cable outer squirm, pedal bushes, cleats...
@BringMeMyFix started
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Tyre squirm, glove squirm (if leather), cable outer squirm, pedal bushes, cleats...