P Metric
With the P-Metric system, Section Width is measured in millimeters.
To convert millimeters into inches, divide by 25.4. The Aspect Ratio (Section Height divided by Section Width) helps provide more dimensional information about the tire size.
Example:

(1) P = Certain tire type used on light duty vehicles such as passenger
cars
(2) Section Width in millimeters
(3) Aspect Ratio (= section height 7 section width).
(4) R = Radial Construction
(5) Rim diameter in inches
See also:
Electronic parking brake system warning
The brake system warning light flashes when the electronic parking
brake system is malfunctioning. If the warning light flashes, promptly park in a
safe location as soon as possible and contact yo ...
Gross Axle Weight (GAW) and Gross Axle Weight Rating (GAWR)
Gross Axle Weight
The total weight applied to each axle (GAW) must never exceed the Gross Axle
Weight Rating (GAWR). The front and rear GAWs can be adjusted by relocating passengers
and luggage ...
