How many teeth on the top sprocket?
8, 9, 10 or 11 speed?
10, not sure on the teeth, not by it right now
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.
@PhilDAS started
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How many teeth on the top sprocket?
8, 9, 10 or 11 speed?