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      11-14-2011, 09:41 PM   #3
Major General

Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

285/35/18 is the widest you can go and still be within the recommended wheel width with stock 18 x 9.5 rear tires. But on one of these cars, you probably do not want to run the minimum wheel width for a tire. I would choose 275/35/18 or 275/40/18 instead. You can see the recommended and measured wheel widths in the specs section for a tire at the Tire Rack website.

I chose to run wider wheels, 18 x 9.5/10.5, which I will fit with 265/35/18 and 285/35/18 tires. One inch wider wheels and nearly one inch wider tires.