I had 1 set of the Old MTRs, [33s]. I ran them for more years than I can recall, but I didn't put that much Street time on them. Ran them slick, & regroved them. Ran 3-4 more years, till the sidewalls started separating. I Did have a lot of weights on them, but they had great grip! A year or so back, I picked up a used set of the New MTR. After I got them mounted, I noticed they had worn More on the open side, than the off-set rib side. Just seems a Natural way it will wear. I haven't put much mileage on them, & mostly used on trails. They Are Heavy, but strong. I'm running soft bead balance now, & have added More beads, for the extra weight. I Still get some bounce. The grip is "sufficient", but Not as good as the Old style. I air down to 10 psi. Run 24 psi on the road. My CJ is probably round 4000#. After 20 + years of radials, I can't see going back to bis ply! No, I won't buy GoodYear again! Like the Kevlar, but will find a different tread! Mine are 35x12.5x15.