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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
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
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 charac-
teristics 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 673
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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.
674 IF YOU NEED CONSUMER ASSISTANCE
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Service Engine Soon (Malfunction Indicator)....319
Side Marker ...........................651
Tire Pressure Monitoring (TPMS) ............318
Traction Control ........................489
Turn Signal ...........................124
Voltage ..............................325
Warning (Instrument Cluster Description) ......314
Loading Vehicle ..........................289
Capacities ............................542
Tires ................................501
Load Leveling System ......................299
Locks ..................................35
Door .................................35
Lubrication, Body .........................620
Luggage Rack (Roof Rack) ...................299
Lug Nuts ...............................571
Maintenance Free Battery ....................616
Maintenance Procedures ....................610 Maintenance Schedule
......................658
Malfunction Indicator Light (Check Engine) .......319
Manual, Service ..........................672
Map/Reading Lights .......................256
Memory Feature (Memory Seat) ...............217
Memory Seat ............................135
Methanol ...............................530
Mini-Trip Computer .......................339
Mirrors ................................132 Automatic Dimming .....................133
Electric Remote .........................135
ExteriorFolding ........................134
Heated ...............................136
Memory ..............................217
Outside ..............................134
Rearview .............................132
Vanity ...............................138
Mode Fuel Saver ............................338
686 INDEX
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Jacking...............................573
LifeofTires ...........................515
Load Capacity .........................501
Pressure Monitor System (TPMS) ............520
Pressure Warning Light ...................318
Quality Grading ........................673
Radial ...............................509
Replacement ...........................516
Rotation ..............................519
Safety ...............................495
Sizes ................................496
Snow Tires ............................510
Spare Tire .............................574
Spinning .............................514
TrailerTowing .........................551
Tread Wear Indicators ....................514
Tire Safety Information .....................495
Tongue Weight/Trailer Weight ................548
Torque Converter Clutch ....................474 Towing ................................543
24-Hour Towing Assistance ................162
Disabled Vehicle ........................600
Guide ...............................547
Recreational ...........................555
Weight...............................547
Towing Assistance .........................162
Towing Vehicle Behind a Motorhome ...........555
Traction ................................475
Traction Control ..........................484
Traction Control Switch .....................484
Trailer Sway Control (TSC) ..................490
TrailerTowing ...........................543 Cooling System Tips .....................554
Hitches ..............................546
Minimum Requirements ..................549
Tips.................................554
Trailer and Tongue Weight .................548
Wiring ...............................552
692 INDEX