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Maybe. Earlier on the same ride home it had slipped for a half turn which made me whack my knee but didn’t come off or anything. Had a look but couldn’t see what had happened. Chain was still in place everywhere it should have been.
I’m just going to swap out the lot, I don’t like Shimano anyway but I don’t trust the cassette and chain any more
could it have slipped down on the rear cassette so the chain slackened suddenly?