So I have new 31x10.50 wrangler duratracs and 15x7 rims on a basically stock, 4.0 aw4 XJ. I just did the chalk test on the front tires only, and don't see any use in the results. I started at 30 psi, where the chalk rubbed off to about 1.5" from the edge, and worked my way down all the way to 15 psi (!), where it rubbed off to about 5/8" from the edge of the full lugs and 1/4" from the scalloped lugs. I didn't bother going lower.
Any suggestions? I guess I'll try the temp-increase method. What's the target rise, 4 psi?
Any suggestions? I guess I'll try the temp-increase method. What's the target rise, 4 psi?