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      02-23-2013, 07:51 AM   #3
cdgatti
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Drives: e90 328i
Join Date: May 2011
Location: KY

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19 and 20 for that matter, are for pure looks, not performance. For optimizing performance considering overall rim/tire weight and sidewall profile the optimum is 17-18 for a street car. Car and Driver (or MT I forget) did a study and article on this recently. They showed overall performance numbers for the same car (VW something) with 15,16,17,18,19 in wheels/tires. The sweetspot was in the 17-18 range.