If you have a Harbor Freight store nearby they have some nice air type tires for $4 or $5 each.
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If you could grind it smooth to thread it might work.I'm looking for a solution to make an axle as well. I've done what was suggested here. with bolt and metal center wheels, but (on our unlevel ground at least) the bolts move enough that it wobbles the hole out over time then the wheels are pretty much useless. My tractor is about 10' wide. I considered running a piece of conduit then putting something of an axel inside that. but I'm not sure what it would be. Another idea would be a piece of all thread, but I've never seen any that long. I'm guessing rebar would be too hard to thread. lol