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:
Driving when tired or sleepy
WARNING
When you are tired or sleepy, your reaction will be delayed and your perception,
judgment and attentiveness will be impaired. If you drive when tired or sleepy,
your, your passengers’ and ...
Front seats
- Never adjust the seat while driving
to avoid the possibility of
loss of vehicle control and of
personal injury.
- Before adjusting the seat, make
sure the hands and feet of rear
seat ...
Sun visors
To block out glare, swing down the visors. To use the sun visor at a side window,
swing it down and move it sideways. ...
