The new 32111 Heavy Duty Wheel Centering Tool Set (3) corrects off-center wheel/stud combinations that can cause wheel hop, vibrations, and premature tire wear. When remounting the wheel/tire assembly onto a hub piloted mount, the extreme weight causes the wheel opening to rest on the upper pilot. This can produce a gap on the other pilots, causing the off-center condition. Simply slide the 3 centering tapered tools over the wheel studs at the 12, 8, and 4 oclock positions; mount the wheel and add the lugnuts , torquing to manufacturers specifications. The wheel is now completely centered.