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Tire Information
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Your tire contains very useful information molded
into the sidewall. It shows the name of the tire, its size, whether
it is tubeless or tube type, the maximum load and maximum inflation,
the important safety warning and much other information. I hope
you find this handy information usefull.
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P215/65R15 89H
Shown here is the sidewall of a popular "P-metric," speed-rated
auto tire.
"P" stands for passenger,
"215" represents the width of the tire in millimeters;
"65" is the ratio of height to width;
"H" is the speed rating;
"R" means radial; and
"15" is the diameter of the wheel in inches.
Some speed-rated tires carry a Service Description, instead
of showing the speed symbol in the size designation. The Service
Description, 89H in this example, consists of the load index
(89) and speed symbol (H). The H in this case indicates the
tire's maximum speed is 130 mph. See the chart below for other
speed ratings:
A "B" in place of the "R" would mean the tire is of belted bias
construction. A "D" in place of the "R" means diagonal bias
construction.
The maximum load is shown in lbs. (pounds) and in kg (kilograms),
and maximum pressure in psi (pounds per square inch) and in
kPa (kilopascals). Kilograms and kilopascals are metric units
of measurement.
The letters "DOT" certify compliance with all applicable safety
standards established by the Department of Transportation (DOT).
Adjacent to this is a tire identification or serial number.
This serial number is a code with up to 11 digits that are a
combination of numbers and letters.
The sidewall also shows the type of cord and number of plies
in the sidewall and under the tread. The DOT requires tire manufacturers
to grade passenger car tires based on three performance factors:
treadwear, traction and temperature resistance.
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