I suspect that it is significantly more complicated than we think, and that you can not make a blanket statement about 18" vs. 19" tires. If we were able to test the two sizes side by side in various road conditions, temps, etc. I would wager that the 18's are better in some circumstances and 19's are better in others ON THE M3. Any conversations about another car brings too many variables in to play that can not be accounted for.
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