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:
To enter the passive mode
If you wish to program the passive arming mode, have it done by your SUBARU dealer. ...
Using the Hands-free system
NOTE
You can select the menus by operating the “TUNE/TRACK/CH” dial or using the voice command system. Refer to “Menu list of the Hands-free system” or “Voice command system”. ...
Vehicle Dynamics Control warning light/ Vehicle Dynamics Control operation indicator light
...
