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 cold tire inflation pressure
For the recommended cold tire inflation pressure for your vehicle’s tires, refer
to “Tires” F12-8. ...
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Two separate circuits
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brake systems. Each circuit works diagonally
across the vehicle. If one circuit of
the brake system should fail, the other half
of the system still works. ...
