I have a 2004 Z4 3.0i with 18x8.5 square at a 30mm offset with 255/35-18 tires all around. The front is close, but there is no rubbing. The rear has plenty of space. Just make sure your offsets are ok, and you should be fine -up to about a 10" rear wheel. You could also just run the wider rear tires on a 9" wheel since 10" should not net you much, if any, performance advantage with only a 265 rear tire. I would go with a 9" rear wheel or perhaps 9.5" rear wheel, or even skate by with 8.5" square.
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