Bent hanger or bent cage, am I right?
Or it could be as simple as the slightly wider pulley cage of the 8-speed RD not playing nicely with the narrow 9-speed chain when it's not pushed to either one side or the other
Haven't thought about this, thanks, I'll try to get a 9sp RD from somewhere (my luck: literally just sold a Sora 3400 less than 2 weeks ago).
@vpCogworks started
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Or it could be as simple as the slightly wider pulley cage of the 8-speed RD not playing nicely with the narrow 9-speed chain when it's not pushed to either one side or the other