Just a thought but if the top sprocket is 11t, then a 12t should stop the chain rubbing the stay.
Have you measured the OLD? The stays may be a little splayed.
Just a thought but if the top sprocket is 11t, then a 12t should stop the chain rubbing the stay
Sometimes using a bigger top sprocket makes the problem worse, due to the seat stay being wider than the dropout :-)
Hadn't thought of that.
@gbj_tester started
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Just a thought but if the top sprocket is 11t, then a 12t should stop the chain rubbing the stay.
Have you measured the OLD? The stays may be a little splayed.