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:
Abbreviation list
You will find several abbreviations in this manual. The meanings of the abbreviations are shown in the following list.
...
When connecting iPod®
Each time you briefly press the “RPT”
button, the mode changes in the following
sequence.
Type C audio:
Type D audio:
NOTE
- The “ALL RPT” indication refers to
the repeat playback of ...
Breaking-in of new brake pads and linings
When replacing the brake pad or lining,
use only genuine SUBARU parts. After
replacement, the new parts must be
broken in as follows. ...
