I got a B7500 (older verison on B7510) I have turf tires on my tractor and the 60" MMM deck. But the guy about a mile from me has bar tires (R4) on his B7500 and only used it to cut the grass with a 60" MMM deck. Does very little damage. I have seen a couple other B7510 and B7610 with the new bar turfs. I might buy a set, to get better traction, but with out destroying customers lawns.