I agree with SR20DE_MAN, a 8.5" width rim is definitely pushing it. Depending on rim offset and tire width, the inside of the tire may rub the strut housing if you're offset is too HIGH (e.g. 48mm), also, the outside of the tire may rub the fender if the offset is too LOW (e.g. 35mm).
7.5" rim width and 225mm wide tires are proven on the b15...unless you are dropped that will just make matters worse. Case in point: with a 205/55R16 tire on a 16x7 rim on a car dropped with Eibach Prokits (1.2", 1.0") the rear tires will almost definitely rub the rear fenders. So how tall the tire is (outside diameter) is just as important as how wide it is when trying to clear the fenders.