Q:

What do the letters in your tire size represent?

A:

Quick Answer

The letters on tires normally indicate whether they are passenger or lightweight truck tires, if the tires are radial and their maximum speed capability. Tires that do not begin with a letter are Euro-metric tires, which have a different load-bearing capability than P-metric tires, according to Goodyear.

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What do the letters in your tire size represent?
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Full Answer

The first letter in the sequence found on tire sidewalls is normally a P, representing P-metric, or LT, which represents that tires meet U.S. requirements for passenger vehicles or were designed for lightweight trucks, explains Goodyear. The R that is often found after a series of numbers stands for "radial tire." The last letter represents the tire's maximum speed rating. An example is H, which means the tire has a maximum speed capability of 130 mph.

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