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:
Cabin & Utility
Roomier by almost 10 percent, the Outback's cabin addresses some of its
predecessor's biggest issues — namely, backseat room. There's plenty of it now,
and abundant headroom, too. The front seats ...
Brake fluid level warning
This light illuminates when the brake fluid
level has dropped to near the “MIN” level
of the brake fluid reservoir with the ignition
switch in the “ON” position and with the
parking brake full ...
State emission testing (U.S. only)
WARNING
Testing of an All-Wheel Drive vehicle must NEVER be performed on a single two-wheel
dynamometer. Attempting to do so will result in uncontrolled vehicle movement and
may cause an accident ...
