But the issue was not there before the chain was swapped. B-screws don't just undo by themselves. Also the issue is with the big cogs, not the small.
I'll take the rear derailleur off, inspect and clean everything including jockey wheels on my lunch. If not then I'll see if I can get it in at a local bike shop to check the hanger before my race on saturday
@hazzelfrazzel started
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But the issue was not there before the chain was swapped. B-screws don't just undo by themselves. Also the issue is with the big cogs, not the small.