The Mastertrack UN203 tire comes in ST175/80R13. It has a Load Index of 91/87 which means the tire is rated to hold up to The tire has a Speed Rating of L so it is rated to go up to 0 mph. The Mastertrack UN203 is made for Light Trucks, CUVs and SUVs. It has a Load Range of C, which is also known as 6 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.