On the stock wheels, you'd likely get a good amount of rub with a 325/60R20. You'd probably see some valance rub and likely rub on the radius arms. The stock 20" wheels are a 20x8", and most 325 tires recommend using at least a 9" wide wheel. Folks have managed to clear 35x12.50" tires on this kit, but if you're using a chunky mud-terrain with a wider total width, you may still rub a smidge.