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:
Precautions against vehicle modification
Always consult your SUBARU dealer if
you want to install any accessory parts to
your vehicle.
Do not perform any of the following
modifications. Such modifications
can interfere with prop ...
Outback
The use of a genuine SUBARU trailer hitch is recommended. A genuine SUBARU hitch
is available from your SUBARU dealer.
If use of a non-genuine hitch is unavoidable, be sure the hitch is suited to
...
Symmetrical All-Wheel Drive: key to Subaru's Brand identity
Subaru will offer two different Symmetrical All-Wheel Drive systems in the
new Subaru Impreza. In models equipped with the five-speed manual, the
Continuous AWD system uses a viscous-coupling to d ...
