My ol lady has a 21 classic 1500 with the 17" rebel wheels. From ram they had Yokohama geolander a/t tires. O.E size was Lt265/70r17. They rode nice, were quiet, she got approx 70,000 miles out of them with diligent rotations and monthly pressure checks. For max life always inflate to pressure indicated on the sidewall(cold). However, with an Lt rated tire, (if your not max hauling) start at max psi and if a tad stif decrease 1 or 2 pounds and try again. However DO NOT go below 10% of recommended pressure