steel on rubber will break the bead with a car's weight behind it on a short ramp
another way is with softer material and a longer ramp. like a 6foot length of hardwood 2x4, or softwood 2x6. lay on tyre and then slowly drive up wood until weight of car breaks the bead
Never broke or tore a bead this way...but then again, I didn't care since I was changing the tire.
