I got a set of cheap 12" tires on-line for 33 bucks a piece and had them put on the rims for 6 bucks each, I didn't even bother getting them balanced because they didn't have equipment to balance 12" tires. I run them at 50 psi, which is about 5 psi over max rating on the sidewall, and I've ran them that way since I got them last June, and I don't really notice any wear at all yet, much less any center wear. Might bump them up a couple of more pounds since I pretty much just creep around anyway
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