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:
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The cruise control set indicator light illuminates when the ignition switch is
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Cruise control indicator light
The cruise control indicator light illuminates when the ignition switch is turned
to the “ON” position and turns off after approximately 3 seconds.
The light illuminates when the “CRUISE” main sw ...
