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 - "205"
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 205mm.
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 205mm equals 133.25.
Tire Construction - "R"
The "R" in this example indicates radial tire construction.
Wheel Diameter - "16"
This indicates the wheel diameter in inches.
Now something very important . "OFFSET"
[You must be registered and logged in to see this image.]