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Hi limit screw looked right. Low limit was spot on. B screw bang on and cable tension was OK.
So why was my shifting crappy?
Turns out the bolts holding the mech hanger to the frame were loose. Never had that before. Feel like a fool now.
It's a bugger, I've found it's less stressful just to start right from the beginning with derailleurs, so you go through all the steps as if you were fitting a new one, less chances of overlooking the basics that way.
A lesson learned. 🦑
It’s a bugger, I’ve found it’s less stressful just to start right from the beginning with derailleurs, so you go through all the steps as if you were fitting a new one, less chances of overlooking the basics that way.
Spot on!
"gear tune"
Check;
no hub play
no excessive freehub play
cassette tight
wheel in straight/tight
mech hanger tight
mech hanger straight
mech tight
mech looks straight/no excessive play
jockey wheel play
Cables seated ok
Chain ok
Cassette ok
H limit
cable tension
L limit
B tension
Cable return ok
(and parts compatibility, you would be surprised!)