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To the OP- Unless you are tracking your vehicle or doing some real serious motoring, it doesn't really matter. BMW vehicle dynamics team decide what type of combo is suited best to everyone. This includes all ages and locations around the globe. A combination of steering response (ie over/understeer), vibrations, noise, harsh ride etc...What they decide might not be what you like.
Wheel size does play an important role, but pay close attention to tire choice as well.
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'08 E92 335xi: the girlfriend
'04 Yamaha R6: the mistress
'99 Mustang Cobra: the wife
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