So I put some sweet new wheels on my 9-5 and sometimes the rear tires rub. I screwed up and bought 245/40-18 instead of 225/40-18. But anyway they only rub when there are 4 people in the car and I go over bumps or dips fast. not big bumps real fast or something stupid like that. I have the eibach springs installed and I was planning on getting Koni's someday. So if I had Koni's I could set them up a bit stiffer and then the tires would rub less because it would take more force to compress the springs right? So it would have to be a bigger bump or dip. I know the Koni's won't effect ride height... Or if anyone has another idea short of new tires... By the way the tires rub on the fenders not the suspension.