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:
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Examples of the types of accidents in which the driver’s/driver’s and front
passenger’s SRS frontal airbag(s) will basically not deploy.
The driver’s and front passenger’s SRS frontal airbags are designed basically
not to deploy if the vehicle is struck from the side or from behind, or if it rolls
onto its side or roof, or if it ...
Recommended cold tire inflation pressure
For the recommended cold tire inflation pressure for your vehicle’s tires, refer
to “Tires” F12-8. ...
