The Grit Master GTM RT 01 tire comes in LT305/55R20. It has a Load Index of 125 which means the tire is rated to hold up to 3638 lbs. The tire has a Speed Rating of Q so it is rated to go up to 100 mph. The Grit Master GTM RT 01 is made for Light Trucks, CUVs and SUVs. It has a Load Range of F, which is also known as 12 Ply. This is maximum safe carrying capacity of the tire. A higher Load Range allows the tire to carry a heavier load. The tire comes in a Black Side Wall.