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DEPARTMENT OF TRANSPORTATION UNIFORM
TIRE QUALITY GRADES
The following tire grading categories were established by
the National Highway Traffic Safety Administration. The
specific grade rating assigned by the tire’s manufacturer
in each category is shown on the sidewall of the tires on
your vehicle.
All passenger car tires must conform to Federal safety
requirements in addition to these grades.
Treadwear
TheTreadwear grade is a comparative rating, based on the
wear rate of the tire when tested under controlled condi-
tions on a specified government test course. For example, a
tire graded 150 would wear one and one-half 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.
Traction Grades
The Traction grades, from highest to lowest, are AA, A, B,
and C. These grades represent the tire’s ability to stop on
wet pavement, as measured under controlled conditions
on specified government test surfaces of asphalt and
concrete. A tire marked C may have poor traction perfor-
mance.
9
IF YOU NEED CONSUMER ASSISTANCE 675
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WARNING!
The traction grade assigned to this tire is based on
straight-ahead braking traction tests, and does not
include acceleration, cornering, hydroplaning, or
peak traction characteristics.
Temperature Grades
The temperature grades are A (the highest), B, and C,
representing the tire’s resistance to the generation of heat
and its ability to dissipate heat, when tested under
controlled conditions on a specified indoor laboratory
test wheel. Sustained high temperature can cause the
material of the tire to degenerate and reduce tire life, andexcessive temperature can lead to sudden tire failure. The
grade C corresponds to a level of performance, which all
passenger car tires must meet under the Federal Motor
Vehicle Safety Standard No. 109. Grades B and A repre-
sent higher levels of performance on the laboratory test
wheel, than the minimum required by law.
WARNING!
The temperature grade for this tire is established for
a tire that is properly inflated and not overloaded.
Excessive speed, under-inflation, or excessive load-
ing, either separately or in combination, can cause
heat buildup and possible tire failure.
676 IF YOU NEED CONSUMER ASSISTANCE
Page 690 of 700

Security Alarm (Theft Alarm)...............324
Service .............................. .649
Service Engine Soon (Malfunction Indicator) . . . .321
Side Marker .......................... .653
Theft Alarm (Security Alarm) ...............324
Tire Pressure Monitoring (TPMS) ............319
Traction Control ....................... .496
Turn Signal .......................... .122
Voltage ............................. .327
Warning (Instrument Cluster Description) ......315
Loading Vehicle ......................... .285
Capacities ........................... .551
Tires ............................... .510
Load Leveling System ..................... .298
Locks ..................................35
Door .................................35
Lubrication, Body ........................ .621
Luggage Rack (Roof Rack) ...................298 Maintenance Free Battery
....................616
Maintenance Procedures ....................610
Maintenance Schedule ..................... .660
Malfunction Indicator Light (Check Engine) .......321
Manual, Service ......................... .674
Map/Reading Lights ...................... .252
Memory Feature (Memory Seat) ...............214
Memory Seat ........................... .133
Methanol .............................. .538
Mini-Trip Computer ...................... .342
Mirrors ............................... .130
Automatic Dimming .....................131
Electric Remote ........................ .133
Exterior Folding ....................... .132
Heated .............................. .134
Memory ............................. .214
Outside ............................. .132
Rearview ............................ .130
V
anity .............................. .135
688 INDEX
Page 696 of 700

Life of Tires.......................... .523
Load Capacity ........................ .510
Pressure Monitor System (TPMS) ............528
Pressure Warning Light ...................319
Quality Grading ....................... .675
Radial .............................. .517
Replacement .......................... .523
Rotation ............................. .527
Safety .............................. .502
Sizes ............................... .504
Snow Tires ........................... .519
Spare Tire ............................ .573
Spinning ............................ .522
Trailer Towing ........................ .561
Tread Wear Indicators ....................522
Tire Safety Information .....................502
Tongue Weight/Trailer Weight ................558
Torque Converter Clutch ....................481 Towing
............................... .551
24-Hour Towing Assistance ................159
Disabled Vehicle ....................... .599
Guide .............................. .557
Recreational .......................... .566
Weight .............................. .557
Towing Assistance ........................ .159
Traction ............................... .482
Traction Control ......................... .492
Traction Control Switch .....................492
Trailer Sway Control (TSC) ..................498
Trailer Towing .......................... .551
Cooling System Tips .....................565
Hitches ............................. .556
Minimum Requirements ..................559
Tips................................ .564
Trailer and Tongue Weight .................558
W
iring .............................. .563
Trailer Towing Guide ...................... .557
694 INDEX