Every tire on the street has markings that indicate its size. "P245/45R19" is an example. What do these markings mean about the tire size?

The first letter indicates the tire's class. "P" means passenger car, while "LT" means light truck. The three numbers after the front letter indicate the width of the tire in millimeters. So, the "245" means the tire is 245 millimeters wide.

The next two numbers, after the "/", indicate the aspect ratio of the sidewall to the tire width. "45" means that the height of the sidewall is 45% of the width of the tire. Forty-five percent of 245 is 110.25, which means the sidewall height is 110.25 millimeters. An "R" indicates the tire is a radial. The number after the "R" designates wheel size. So, this tire would fit 19" rims.

If you need new tires, call the service department here at Jefferson Auto in Washington, PA for assistance.

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