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.
I do have a quick link in there, but all looks fine to me.
I have a spare chainset somewhere, so may throw that on, see if it solves it, if not, then bottom bracket... Another Sunday in the shed instead if riding.
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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.