I have 18x7's in the front with 225/45-18, and 22x9 out back witih 265/35-22. The front ones are fine, the back ones rub ironically not on the inside or outside sidewall, but at the rear of the tire near the body mount. I've taken the grinder to that part and clearanced it without any structural or asthetic damage to the car, then re-undercoated it. The wheels are Coys C-5s, but I don't know what the BS is. A 10" wheel in the back would be too wide, regardless of the BS.