jockey wheel in correct position below highest gear, chain won’t release second highest gear sprocket
B-tension issue? If the pulley is too close to to the sprocket, the chain can be reluctant to climb off the larger sprocket
Worth a bash, I was wondering if chain age might be a factor? It’s possible that the chain is very old.
Was anything changed recently?
Could be.
I have also had similar issues where the spring at the mech hangar (b -tension spring) had got clogged/dirty and so was sticking and not springing back properly.
@Dammit started
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B-tension issue? If the pulley is too close to to the sprocket, the chain can be reluctant to climb off the larger sprocket