The best thing for removing tires from an old rim is a heavy sledge and some tire wedges. The wedges are cut from some 3" angle iron about 5" long. Locate a couple of them so the edge is about to go under the lip of the rim and hammer away. Safety goggles are recommended, as is a hardhat in case the hammer hits rubber and comes back up at you.
Once the tire wedges are beat into shape, they work even better.
When I was in the army, I remember having a tractor trailer tire once in that we couldn't budge off the rim. We had fairly expensive machines (coats 5000HIT) for this type of job and the machine was starting to bend. So we sent it downtown, and a little guy with his hammer and wedges had it off in 10 minutes. That was after we struggled, to no avail, for much longer than that.
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