Turf tires, and see if you can do like I did and get an extra set of tires and wheels - used. I Had standard R-3s, but even they were making ruts (driver new to larger tractor, too excited to remember clayish wet soil and not to turn sharp!), so I was looking around and found a set of special tuirfs on ebay, waited for the auction to fail, and got the tires $ wheels for about 300 lower than the auction for a brand new set of Special turfs, and now after a few trial runs on my grass, you can tell where the tractor has been, bit it is only temporary. and boy did my ride get a lot more softer!