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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
gbj_tester-
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).
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Installed an Alivio RD-4000, brand new, nearly same issue occurs. Upper and lower limits are seemingly perfect, cable tension has been fiddled with, and it just won't shift down to 4th and won't shift up to 8th speed. I bought the derailleur from a bike shop, mechanic guy clamped the bike on a stand, eyeballed the hanger and said it should be straight—I don't see any sort of deformation either. Brand new shift cable and housings btw.
Shifter is crisp and feels great in general, but is rather old and used, can by any chance that be the issue?
vpCogworks
Need some help folks, although I already think I know the answer.
1x9 setup, XT 737 rear derailleur, Sunrace 1x crankset, narrow wide chainring. 9-8-7th gears are perfectly fine, 6-5-4th are noisy and jumpy and don't even shift sometimes, 3-2-1st are fine again.
Bent hanger or bent cage, am I right? How eff'd I am on the first case, given we're talking about an aluminium bike with a non-replaceble hanger?
Shifting up to the 4th cog is worse than shifting down onto it though, when downshifting I figured it would be a bit better, but already fiddled quite a lot with cable tension.
There is no wobble on the chainring or on the casette.
Edit: might have been the tension after all, but I'll only be sure tomorrow. Not convinced though.