There are companies who "retread" tires. They have been around for a while. The OTR truck industry uses it quite a bit. Although, they are no longer "retreads", as the technology has allowed them to be much more better. They are truly remolded. This is very similar to how tires are made, they are just recycling the carcass and re-vulcanizing the tread cap to the carcass.

It ain't your grandma's retread. <img src="/forums/images/graemlins/smile.gif" alt="" />

Another company to look at is HiTech retreads.

Michael