Cut them in half, and sell them for 10 or 15 bucks a half, collectors will buy them, they sell them in the junk magazines ( harriet carter, ect... ) for like 30 a half. I don't think theres any use for used nascar tires, other than for collecting. It's somthing like 2 grand a set actully, saw that on a speed channel, comment made by bootie Baker, cause they were talking about tires.