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uuChecking and Maintaining Tires uTire and Loading Information Label
Continued
Maintenance
Tire and Loading Information LabelThe label attached to the driver’s doorjamb provides necessary tire and loading
information.Tire Labeling
The 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.
1 Tire 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, if
equipped.dThe proper cold tire pressure for front, rear, and
spare, if equipped.
Label
ExampleExample
Tire Size
Tire
Identification
Number (TIN)
Maximum
Tire Load
Maximum
Tire Pressure
Tire Size■
Tire Sizes
1 Tire Sizes
Following is an example of tire size with an
explanation of what each component means.
225/50R18 95H
225: Tire width in millimeters.
50: Aspect ratio (the tire’s section height as a
percentage of its width).
R: Tire construction code (R indicates radial).
18: Rim diameter in inches.
95: 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).
459
uuChecking and Maintaining Tires uDOT 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 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. Th e 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
1 Uniform Tire Quality GradingFor example:
Treadwear 200
Traction AA
Temperature A
All passenger car tires must conform
to Federal Safety Requirements in
addition to these grades.
