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:
Adverse safety consequences of under-inflation
Driving at high speeds with excessively low tire pressures can cause the tires
to flex severely and to rapidly become hot. A sharp increase in temperature could
cause tread separation, and failure ...
Except 2.5 L turbo models
Your vehicle is equipped with “all season tires” which are designed to provide
an adequate measure of traction, handling and braking performance in year-round
driving. In winter, it may be possibl ...
Safety & Reliability
In crash tests from the Insurance Institute for Highway Safety, the Forester
earned the top score, Good, in front and side impacts. The SUV was awarded an
IIHS Top Safety Pick designation. Because ...
