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      11-05-2020, 10:05 PM   #2
MineralWhiteF80
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Drives: Mineral White ///M4 (sold F80)
Join Date: Mar 2015
Location: Atlanta,Ga

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I don't know either but I would like to see the reasoning on how the wheel/tire combos were decided between the GTS and CS.

I know it's not this simple but according to TireRack, the tread width on the Cup2 GTS specific rear tire is 0.4" wider than the MP4S or MPSS Bmw tires (9.9" vs 10.3" wide, same section width), answering the 0.5" wider GTS wheel question. But(!) the Cup2 265/35/19 front tire is 0.3" narrower than the 265/35/20 MP4S or MPSS. So that kinda throws out the basic idea that a Cup2 is just a wider tire overall, hence needing a wider wheel width to control tire roll.
Appreciate 0