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:
Recommended brake fluid
CAUTION
Never use different brands of brake fluid together. Also, avoid mixing DOT 3
and DOT 4 brake fluids even if they are the same brand. ...
Coolant temperature low indicator light/Coolant temperature high warning light
CAUTION
● After turning the ignition switch to the “ON” position, if this indicator light/warning
light behaves under any of the following conditions, the electrical system may be
malfuncti ...
Tire chains
Tire chains cannot be used on your
vehicle because of the lack of
clearance between the tires and
vehicle body.
NOTE
When tire chains cannot be used, use
of another type of traction dev ...
