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I was told about the Nitto NT 850 tires and that tire size by a friend that sells tires. I can't even find that size or style on the Nitto website, but they are out there and they are not overly expensive. They are rated high in mileage and workability. The size is a definite step down from the original 275/55/20 size tires that was on the truck. A total of 1.38 inches overall diameter. The handling is great.