I ran the bias 39.5's on 15x10 beadlocks. I would be at 2-3 pounds in front with 130lbs of water in each and 4psi in the rear, and I had a lot of mixed feelings. For one, with 10in wheels these tires are BALLOONS! second, they measured out at 36.5in when aired down, third, in order to get decent grip and flex on a light rig, they have to be next to no psi and down that low they would often flex sidewall down to the rim and roll over. Almost too flexible.. These tires would impress the hell out of me sometimes and dissapoint me at others. They are horrible when wet.. An 8in rim would make them work much better, but red crawlers are what I want so these tires will never measure up... On the plus side, iroks are super tough, good on snow, and will impress the hell out of you from time to time. BUT In dry rocks and driving to and from the trails, 37in KM2's last longer and stick better...
