The speed rating tells you the maximum speed capability of the tire when properly inflated. Choosing a tire with an equal or greater speed rating than the original equipment tire is generally recommended.
Load Index: G (146 lbs.)
The load index indicates the maximum weight that a tire can support when properly inflated. The higher the tire's load index number, the greater its load carrying capacity. Choosing a tire with a lower load index than the original equipment specifications means that the tire will not carry the load capacity of the original.
The RM120™ is a long haul trailer tire for even wear and miles to removal.