this sort of thing is common if your using an old chain on a new sprocket but your not so i'm a bit stumped.
Is the sprocket from a 9 speed cassette? If so did you put it on the right way around? Or could you try a different one from that cassette?
This isn't a cheap solution but you could maybe try using a bigger ring and a bigger sprocket so that the chain has more teeth to grip but you have the same ratio.
this sort of thing is common if your using an old chain on a new sprocket but your not so i'm a bit stumped.
Is the sprocket from a 9 speed cassette? If so did you put it on the right way around? Or could you try a different one from that cassette?
This isn't a cheap solution but you could maybe try using a bigger ring and a bigger sprocket so that the chain has more teeth to grip but you have the same ratio.