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I think we have a winner! It occurred to me that while I said it happens in any/all gears, I only ever really use one chainring (only really need 4 gears where I am)… following your comment I rode around in the others a bit, and no grinding cage pulling strangeness…. Guess I’m cleaning up the middle chainring this evening then (edit) just in case it’s the filthiness rather than being worn which is causing the issue.
Thanks!
JonD
Maybe chainsuck? The mech cage pulling forwards would be due to tension between the cage and the bottom of the chainrings, I'd have thought.