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:
Safety symbol
You will find a circle with a slash through it
in this manual. This symbol means“Do not”, “Do not do this”, or“Do not let this
happen”, depending upon the context. ...
Driving when tired or sleepy
When you are tired or sleepy, your
reaction time will be delayed and
your perception, judgment and attentiveness
will be impaired. If you
drive when tired or sleepy, your,
your passenger ...
Acc
In this position the electrical accessories
(radio, accessory power outlet, etc.) can
be used. ...
