245/40/18 would be a tough fit if you're lowered and don't have a lot of camber. Once you get to the 245+ front tires the overall tire diameter becomes an issue with the outside corner of the bumper. I actually find a 255/35/18 fits better then the 245/40/18 just because the overall diameter of the tire is 0.7" shorter
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07 Z4 M Coupe AW/IR
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