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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 Sizes
Following is an example of tire size with an
explanation of what each component means.175/65R15 84S
175: Tire width in millimeters.
65: Aspect ratio (the tire’s section height as a percentage of its width).
R: Tire construction code (R indicates radial).
15: Rim diameter in inches.
84: Load index (a numerical code associated with the
maximum load the tire can carry).
S: Speed symbol (an alphabetical code indicating the maximum speed rating).
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uuChecking and Maintaining TiresuDOT Tire Quality Grading (U.S. Vehicles)
Continued
Maintenance
DOT Tire Quality Grading (U.S. Vehicles)
The tires on your ve hicle meet all U.S. Federal Safety
Requirements. All tires are also graded for treadwear, traction, and temperature pe rformance 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 significa ntly 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 AATemperature A All passenger car tires must conform to Federal Safety Requirements in addition to these grades.
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