NITTO 38x15.50R18LT, Mud Grappler Part Number: NIT200-500 Tire Size: 38x15.50R18LT Black Side Wall Tread Depth: 21/32 Overall Diameter: 37.72 Approved Rim: 11 - 13 Max Load: 3970 Load Rating: D Speed Rating: Q The Nitto Mud Grappler Extreme Terrain tires are designed to provide exceptional off-road traction. The Mud Grappler features monstrous 15mm side-lugs, which provide excellent sidewall puncture resistance along with outstanding rock crawling and mud traction. The computer designed tread pattern features a high void ratio for excellent clearing of mud and dirt, anti-side slip grooves for better lateral traction, and sipes for performance on snow and slush. The Mud Grappler features three-ply, high turn-up polyester sidewalls that provide strength and durability in demanding terrain.