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I assumed wrapping the chain further around the cog would stop the jumping. I’ll tweak it the other way incrementally to see if there is any improvement

I have a nine speed quick neo. With a new chain and cassette installed by a bike mechanic. My chronic problem is chain jump under torque in ninth gear. Its mostly infrequent but irritating. Perhaps every quarter mile the chain will jump once. I’ve tweeked the high screw and barrel...