I had this problem as well with 18x8.5. The trick is to take a hammer to the inside of the wheelwell at the point where it meets the rear bumper. Gently push the inside edge upward. You will also have to remove the bumper and trim off the top of the wheelwell lip. It rubs because the Alero rear wheels are not centered in the wheelwell, so when you lower + widen the stance the wheel hits the lip at the back. Mine would rub without anyone in the back if I hit a bump.
stock tires lol for winter
