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:
Callback
1. Select the “CALL BACK” menu.
2. Select the desired number by operating the “TUNE/TRACK/CH” dial.
3. Select the “DIAL” menu or press the OFF hook switch . ...
Construction type
Applicable construction of this tire.
For example, “TUBELESS STEEL
BELTED RADIAL” ...
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
...
