I have the old style MTR 37 12.50 R15 and was more than impressed with them until KOH this year. I dont know if the rocks got sharper or my tires are braking down, but they took a beating. 2 sidewall 2" gashes and a ton of lugs ripped completely off. Luckily everything got volcanized and are holding air. But I dont know if I will buy them again as an offroad only tire. Luckily I got the five of them brand new on rims for 600 bucks.