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:
Pocket (if equipped)
CAUTION
Do not use the pocket as an ashtray or leave a lighted cigarette in the pocket.
This could cause a fire.
To use the pocket, open the lid. ...
Tire labeling
Many markings (e.g. Tire size, Tire
Identification Number or TIN) are
placed on the sidewall of a tire by
tire manufacturers. These markings
can provide you with useful information
on the ti ...
Car phone/cell phone and driving
CAUTION
Do not use a car phone/cell phone while driving; it may distract your attention
from driving and can lead to an accident. If you use a car phone/cell phone, pull
off the road and park in ...
