I use square OEM rears for the track. The fronts stick out more so you'll need a spacer in the rear to even it out. 285s should work with some additional camber...as long as you don't have strut clearance issues.
I have 275s with no issues. May have to go with 285/30R18s.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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