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      11-01-2019, 11:02 AM   #8
M5theonlyone
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Drives: BMW M5 V8 Gunmetal
Join Date: Aug 2018
Location: Southern England

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Quote:
Originally Posted by apexit4 View Post
Supposedly the change to 18 inch wheels isnt only for aesthetics. I recently read that the amount of flex in the larger sidewall of the 13 inch tire contributes to the dirty air problem that affects following cars.
I suppose a wind tunnel test of a mock up or the real thing will reveal if that's the case.