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:
Foreword
Congratulations on choosing a SUBARU vehicle. This Owner’s
Manual has all the information necessary to keep your SUBARU in
excellent condition and to properly maintain the emission control
syste ...
Help line
The help line (distance marker and vehicle width line) is a guide to help you
realize the actual distance from the screen.
Help lines displayed on the navigation monitor
Help lines displayed o ...
Turbo models
Turbo models
1) Power steering fluid reservoir
2) Differential gear oil level gauge (AT)
3) Clutch fluid reservoir
4) Automatic transmission fluid level gauge
5) Brake fluid reservoir
6) ...
