Ideal for the 275-50-17's. It depends on the shape of the tire, specifically it's max width and it's tread width. My measurements show that for my car, with the 8.25" rear, a 4" BS would mount the most tires in the center of the wheel well, which has a max width between leaf springs and inside of fender lip of 11 5/8". Below is my amatuerish attaempt at measuring the wheelwell opening.