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:
FM reception
Although FM is normally static free, reception can be affected by the surrounding
area, atmospheric conditions, station strength and transmitter distance. Buildings
or other obstructions may cause ...
Electrical system
AT: Automatic transmission
MT: Manual transmission ...
Abbreviation list
You will find several abbreviations in this
manual. The meanings of the abbreviations
are shown in the following list.
...
