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:
RDS text display
If the PS (Program Service Name) and/or RT (Radio Text) are available, pressing
the “TEXT” button changes the display among PS, RT and frequency. The initial setting
is “PS”.
NOTE
● The ...
Snow tires
WARNING
● When replacing original tires with winter (snow) tires, make sure you use only
the same size, construction and load range as the original tires listed on the tire
placard. Using o ...
Other markings
The following makings are also placed on the sidewall.
Maximum permissible inflation pressure
The maximum cold inflation pressure to which this tire may be inflated. For example,
“350 kPa (51 PSI) ...
