It depends, we have one set of irrigation specials, theyre 11X24.5 though, thats original to the pivot from 1978, theyre pretty weather cracked but are still holding air, pretty sure they have tube in them though.

The question is do ya feel lucky punk? Lol I prefer not rolling a wheel and tire into the middle of a field in August, but others might enjoy it! I wish there was a way to market that and changing out gearboxes to health nuts from Omaha looking for the next great "get fit workout" haha.

Edit to add: We have one set of Mach II plastic tires on one machine, the jury is still out, ours just happened to have the "old style" with only 3 bolts, and weve had a few break over winter, but the "new style" has 5 or 6 cant remember off hand, and havent had a problem with those. Sounds like were gonna get a pair of the green plastic ones to replace a pair of the old Mach IIs. But it is nice not having to worry about flats or anything like that, overall weve been happy with them.