Chain jumps on one sprocket
Hello All
Hope you can help. I've just replaced chain wheels, chain, jockey wheels on rear mech and 9 spd cassette, all veloce on my Bianchi. Everything is great except the chain constantly jumps whenever I use the 4th sprocket (19 tooth) on both the inner and outer rings. All other combinations are ok. Any advice welcomed!!
I've looked on the forum but haven't found an answer to this prob.
Rgds
Fred Lowry