I don't know if this si relevant to the thread. I have a ride-on lawnmower, and use it to cut a field which also has about 100 plum trees. The plum trees have vicious spikes on them, and these inevitably end up on the ground, and of course, then end up in the mower tyres. The tyres puncture extremely easily – they are not made of rubber, but some variety of nylon, and apparently have little or no resistance to penetration. At first I found it was impossible to get them repaired – patches won't stick because of the nylon, and our local tyre repair man tried using plugs, but could not get them to stay in place, because the rubber plugs apparently didn't have enough friction against the nylon tyres.
After much searching, I found a repair kit in the UK that had been imported from the US – it uses a sort of gun to push soft rubber mushroom shaped plugs through the tyre from the outside, head-first, then the tyre pressure forces the expanded plug head into contact with the inside wall of the tyre. It works, but cost 48 pounds about 8 years ago, with sufficient plugs to repair 20 holes. An extra bag of 20 plugs was another 10 pounds.
Eventually, the tyres reached a point where I was putting plugs virtually alongside each other, so I decided to get new tyres – they cost just under 1000 Euros for the four tyres (two large and two small), and that was a (relatively) good offer. I am now going to buy several goats – they have to be cheaper and more efficient!.
I don't want to put you off using these mower tyres, just to give warning. I think if you can get tyres for the 'road-going' type of ATV, then they will be made of rubber, and this problem will not occur, but they may still be expensive.