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:
Steps for Determining Correct Load Limit
1. Locate the statement “The combined
weight of occupants and
cargo should never exceed XXX
pounds” on your vehicle’s placard.
2. Determine the combined weight
of the driver and passengers th ...
Tachometer
The tachometer shows the engine speed
in thousands of revolutions per minute.
Do not operate the engine with the
pointer of the tachometer in the red
zone. This may cause severe damage
to ...
Engine exhaust gas (carbon monoxide)
- Never inhale engine exhaust gas.
Engine exhaust gas contains
carbon monoxide, a colorless
and odorless gas which is dangerous,
or even lethal, if inhaled.
- Always properly maintain the ...
