I've had my tractor 15 years and the only complaint I have is the front tires going flat. I've unmounted and remounted them myself, I've taken them to a local industrial tire place and had them buff the rims and mount them, one or both of them still had slow leaks. The tires have both been replaced once, that didn't help. The only thing that stopped the slow leaks was putting tubes in, but as soon as I get a thorn or nail through the tire I get tired of having to take the whole tire apart every time I get a flat so I go back to tubeless. I've inflated them to high pressure and put them in the horse trough to look for a leak but can't find anything, takes about a week or so for it to go from 22# down to about 12#, then I fill it back up. If I ever have the tires off again I'm going to use bead sealer, see if that solves the problem. I used slime once and ruined a few tire pressure gauges when the tire stem pukes that stuff out, so I'm not doing that again.