I have FR500's on my car (10.5's in back) with Nitto 315's and when you first put th rims on it looks like they will rub the IRS bolt but as you lower the car back down the IRS bolt goes down with the body into a place where ther is more clearance, I plan on putting Hoosier 315's on this spring and I'm not worried about them rubbing. Lethal Performance sells a IRS bolt that's for more clearance too. There is plenty of room in the wheel wells too.