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Hello! On my girlfriends bike I have just got a new cassette and chain fitted since the shifting wasn't great, also some new cables. However the person who fit tried for ages and couldn't get the shifting correct. Sadly I am not specifically sure of what. He mentioned it was probably one of the jockey wheels being loose.
Simply put what are the possible causes here? Here is me prodding the rear jockey wheel which has some movement.
It should have some movement. Jockey wheel looks fine.
Try indexing. Road bike here
Are you sure that the cable is going the right way around the clamp bolt?
You don't say what mech it is, but with Shimano, some go one side of the bolt, some go the other. The Shimano manual will show which.
Jockey wheels look fine, btw.
Tillydog might be into something.
Cable routing at its end clamp looks a bit odd?
Could be :Bent mech hanger. Cable tension too tight or too loose. Cable routing not allowing cable to move freely. Limits not set up on RD correctly. Is chain direction specific and on the right way round? Clunky / sticky shifter?
To me, cable looks like it has been cut too short on the RD not allowing any further adjustment. I tend to only cut cables and cap it once the indexing has been done and leave a little bit of extra to allow as adjustment.
I would suggest that insert a new cable, leave it uncut and work through a video on You Tube for indexing gears and check the above points along the way.
Good luck with it.
Cable outer loop to the rear mech looks way too short/tight, plus the inner looks to be clamped on the wrong side of the bolt. Fix those and go from there.
Jockey wheels are fine. +1 outer 'loop' to derailleur being too tight. +1 rear hanger alignment. +1 chain facing the right way. You can buy a tool to check alignment for ~£30 and it's well worth having. Also worth a check is the cable router under the bottom bracket: is this clean? I've had build up of sticky sports drink under here that has fouled shifting, give it a brush with an old wet toothbrush and douse with some WD40 or similar.