2nd October 2019

trucktrend
14

What does 108s mean on a tire?

In both cases, the "R" stands for radial, and the "H" is the speed rating (more later). The "109" in the ISO metric system indicates the load index for the tire, and the "109H" speed and load combination is often called the "service description."

What does AT stand for on tires?

If there is a "P" on the sidewall, it stands for "passenger car." This refers to the U.S. (P-metric) method of tire sizing. "LT" stands for Light Truck, "ST" is for Special Trailer and "T" stands for Temporary, which is primarily used for small spare tires.
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