The Nitto Mud Grappler 38x15.50R18LT is an extreme mud-terrain light-truck tire with a 128Q service description and load range D. Large tread lugs and open voids are designed for traction in dirt, rock and mud on a compatible 18-inch wheel setup.
Published dimensions are 37.72 inches in diameter and 16.3 inches in inflated width, using a measuring rim 12.5 inches wide. Approved wheel widths run from 11 to 14 inches, and new tread depth is listed at 21/32 inch. Open tread voids help clear mud and dirt, while the lug arrangement maintains ground contact for off-road traction. Choose between lizard-skin-textured sidewall lugs and plain sidewall lugs for the outward-facing appearance.
Maximum single-tire load is 3,970 lb at 50 psi. Match the tire size, wheel dimensions, load and speed requirements to your vehicle, then have a qualified installer check steering and suspension clearance. Published dimensions do not guarantee vehicle-specific fitment. Select operating inflation using the vehicle placard and applicable load/inflation guidance; the listed maximum-load pressure is not a recommended operating pressure.