Whatever size fits under E46 M3s will fit under an MZ4, except the inside front has about 10mm less clearance because of the strut design (the MZ4 uses E36 M3 style struts). So if you're in stock class with stock rules, you can probably safely run 245s up front and 255s in the rear (I assume stock rules stipulate that you can only run the widest size tire that came on the car).
Does AS allow for camber shims on the bottom of the strut?
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