542
For U.S.A.
13-1. For U.S.A.
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The following information has been
compiled according to Code of
Federal Regulations “Title 49, Part
575”.
13-2. Tire Information
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& Tire Labeling
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Many markings (e.g. Tire size, Tire
Identification Number or TIN) are
placed on the sidewall of a tire by
tire manufacturers. These marking
can provide you with useful information
on the tire.
! Tire size
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Your vehicle comes equipped with
P-Metric tire size. It is important to
understand the sizing system in
selecting the proper tire for your
vehicles. Here is a brief review of
the tire sizing system with a breakdown
of its individual elements.
! P Metric
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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
! Load and Speed Rating
Descriptions
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The load and speed rating descriptions
will appear following the size
designation.
They provide two important facts
about the tire. First, the number
designation is its load index. Second,
the letter designation indicates
the tire’s speed rating.