The Trailer King King RSTII tire comes in ST225/75R15. It has a Load Index of 117/112 which means the tire is rated to hold up to 2833 lbs. The tire has a Speed Rating of M so it is rated to go up to 81 mph. The Trailer King King RSTII is made for Light Trucks, CUVs and SUVs. It has a Load Range of E, which is also known as 10 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.