3mm on a 36cm chain stay with a 1/8" chain could be noisy and wear one side of the ring and sprocket and both inside faces of the chain quicker.
Without a tan^-1 function, I think that's about 5 degrees of deviation which sounds like a lot.
@Emyr started
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Without a tan^-1 function, I think that's about 5 degrees of deviation which sounds like a lot.