I've got a 2005 Z4 3.0 with 18" wheels and runflats. I got about 25K miles on 'em. The fronts still look pretty good (and even wear across the tread). The rears have much more wear on the inside of the tires. I notice when I look at the back of the car that the wheels seem to have a slight slant to them. Top of the tires closer to the center of the car. This is my first car with independant rear suspension, so I've figured that this is the normal way they sit. I know they have adjustments and I'd assume mine might need adjusting to eliminate the uneven tire wear. I don't really care right now because I hoping to get rid of the run-flats and the sooner the better. BUT, when I do get my new tires I'm going to get everything aligned. Am I correct in my thinking? :?