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      12-30-2012, 09:46 AM   #3
M3SQRD
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Drives: E92 M3,R56 S,F22 228iX,F82 M4
Join Date: Jun 2009
Location: EC

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Just as Transfer stated, the 18x8et20 is the OEM M3 winter wheel size (style 270M). BMW recommends a 235/40 square tire setup but you'll be fine with 245/40 tires (I'm running a staggered 235/40 and 255/40 setup). As for appearance, that's up to you but I agree with Transfer...you should run spacers to push the 8et20 wheels out to at least the stock frontspacing.