Just put a new cassette, rear mech & chain on, but when I pedal the mech tends to “flick” backward & forward.
When I have the bike up on the stand all is ok so only occurring under the pressure of me riding, help!!
B screw set, brand new XT chain with new Powerlink, all running freely, will try new 22 & 32 tooth rings as doesn’t do it on top ring which hardly gets used.
Thanks for all the helpful comments everyone.