Join Date: Dec 2000
Drive on out to Harbor freight and get the el-cheapo tire changer. I got mine on sale for $35 bucks, one of the most used tools i have. It has changed 100+ tires. It has an arm that breaks the bead. The secret is tire soap, use plenty. The changer needs to be mounted to a secure surface, but we had it screwed to plywood for a while, kinda awkward but works. It is now bolted to some steel thats anchored to the ground in concrete.
Probably not much help at a wrecking yard, but there are hand held bead breakers. I tried it once, what a piece of shit. You can also purchase hand tools that service truck tires. bars and bead hammer, they would do the job.
BTW driving a car on the wheel/tire is a good way to put a nice dent in a fender or warp a rim, You must remove the valve core before breaking the bead(lets the air out).