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:
Vehicle Dynamics Control warning light/Vehicle Dynamics Control operation indicator
light
The light illuminates when the ignition switch is turned to the “ON” position
and turns off several seconds after the engine has started. This lighting pattern
indicates that the Vehicle Dynamic ...
Tire pressure monitoring system (TPMS) (U.S.-spec. models)
Type A
Type B
The tire pressure monitoring system provides
the driver with a warning message
by sending a signal from a sensor that is
installed in each wheel when tire pressure
is s ...
Example of accident in which the driver’s/driver’s and front passenger’s SRS
frontal airbag(s) will most likely deploy.
A head-on collision against a thick concrete wall at a vehicle speed of 12 to 19 mph (20 to 30 km/h) or higher activates only the driver’s SRS frontal airbag or both driver’s and front passenger’s S ...
