578
uuChecking and Maintaining Tires uTire and Loading Information Label
Maintenance
Tire and Loading Information Label
The label attached to the driver’s doorj amb 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 as shown.
Whenever tires are replaced, they should be replaced with tires of the same size.
1 Tire and Loading Information Label
The tire and loading informat ion 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
1 Tire Sizes
Following is an example of tire size with an
explanation of what each component means.
P235/60 R18 102T
P: Vehicle type (P indi cates passenger vehicle).
235: Tire width in millimeters.
60: 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.
102: Load index (a numerical code associated with
the maximum load the tire can carry).
T: Speed symbol (an alphabe tical code indicating the
maximum speed rating).
580
uuChecking and Maintaining Tires uDOT Tire Quality Grading (U.S. Vehicles)
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 a ccording 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 an d maximum section width.
The treadwear grade is a comparative rating based on the wear
rate of the tire when tested un der 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 co nditions 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 Grading
For example:
Treadwear 200
Traction AA
Temperature A
All passenger car tires must conform
to Federal Safety Requirements in
addition to these grades.
