There is a size you can use that is a little larger than the 235-75-15. The 235-75-15 is supposed to be 28.9" in diameter. I run 7.00-15. They measure about 29.5+" in diameter. Some people don't like narrow tires, but these have good tread for mud. The ones I have are discontinued, but the CO-OP sells the size in a Grip Spur. Or at least they do in TN. They are an aggressive directional nylon belted heavy duty tire. They are probably designed for farm work, but they made a world of difference on my tracker. Also, at the present time, I have no lift of any kind and they don't rub even at full steering wheel lock.