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uuChecking and Maintaining TiresuTire and Loading Information Label
Continued
Maintenance
Tire and Loading Information Label
The label attached to the driver’s doorjamb provides necessary tire and loading information.
Tire LabelingThe tires that came on your vehicle have a
number of markings. Those you should be
aware of are described below.
Whenever tires are replaced, they should be replaced with tires of the same size.
1Tire and Loading Information Label
The tire and loading information label attached to the
driver’s doorjamb contains:
aThe number of people your vehicle can carry.
bThe total weight your vehicle can carry. Do not
exceed this weight.
cThe original tire sizes for front, rear, and spare.
dThe proper cold tire pressure for front, rear, and
spare.
Label
Example
Example Tire Size
Tire
Identification
Number (TIN)
Maximum Tire Load
Maximum
Tire Pressure
Tire Size
■Tire Sizes
1Tire Size
Following is an example of tire size with an
explanation of what each component means.
P205/55 R16 89H
P: Vehicle type (P indicates passenger vehicle).
205: Tire width in millimeters.
55: Aspect ratio (the tire’s section height as a
percentage of its width).
R: Tire construction code (R indicates radial).
16: Rim diameter in inches.
89: Load index (a numerical code associated with the
maximum load the tire can carry).
H: Speed symbol (an alphabetical code indicating the
maximum speed rating).
283
uuChecking and Maintaining TiresuDOT Tire Quality Grading (U.S. Vehicles)
Continued
Maintenance
DOT Tire Quality Grading (U.S. Vehicles)
The tires on your vehicle meet all U.S. Federal Safety
Requirements. All tires are also graded for treadwear, traction,
and temperature performance according to Department of
Transportation (DOT) standards. The following explains these
gradings.
Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width.
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a
specified government test course. For example, a tire graded 150
would wear one and one-half (1 1/2) times as well on the
government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however,
and may depart significantly from the norm due to variations in
driving habits, service practices and differences in road
characteristics and climate.
■Uniform Tire Quality Grading
■Treadwear
1Uniform Tire Quality Grading
For example:
Treadwear 200Traction AA
Temperature A
All passenger car tires must conform
to Federal Safety Requirements in addition to these grades.
