Tire Class - “P”
The first character(s) in a tire size designate the tire’s class. In this example, “P” indicates that the tire is a passenger car tire. An “LT” before the tire size designates a light truck tire, and no letter before the size indicates that it is a European metric tire.

Section Width - “215″
A metric tire’s section width is measured in millimeters. This measurement is taken from sidewall to sidewall. In this example, the section width of the tire is 215mm.

Aspect Ratio - “65″
This number refers to the height of the sidewall. It is a percentage of the section width. In this example, 65 percent of the section width of 215mm equals 133.25.

Tire Construction - “R”
The “R” in this example indicates radial tire construction.

Wheel Diameter - “15″
This indicates the wheel diameter in inches.

89H

Load Index & speed ratio = This particular tire has an industry-standard maximum service speed of 130 mph. Some tires use an older European system that features the speed rating in the size description of the tire.