Break the bead by laying the wheel on the driveway, place a 2x4 like a ramp on the tire so the edge is just short of the rim and drive a car/truck up the ramp. I have had some so stubborn, I'd have to pound the tire with a mallet before the bead popped. Just be careful. Once the bead is popped, a little soapy water, a prybar and some old fashioned sweat and you'll get them right off.

If you don't want to mar the wheels, place some plywood down first.