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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 645
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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, and
excessive 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 MotorVehicle 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.
646 IF YOU NEED CONSUMER ASSISTANCE
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Service.............................. .618
Service Engine Soon (Malfunction Indicator) . . . .289
Side Marker .......................... .622
Tire Pressure Monitoring (TPMS) ............289
Traction Control ....................... .470
Turn Signal ............................110
Warning (Instrument Cluster Description) ......289
Loading Vehicle ......................... .260
Capacities ........................... .523
Tires ............................... .482
Load Leveling System ..................... .271
Locks ..................................35
Door .................................35
Lubrication, Body ........................ .590
Luggage Rack (Roof Rack) ...................272
Lug Nuts .............................. .541
Maintenance Free Battery ....................586
Maintenance Procedures ....................580 Maintenance Schedule
..................... .630
Malfunction Indicator Light (Check Engine) .......289
Manual, Service ......................... .644
Map/Reading Lights ...................... .228
Memory Feature (Memory Seat) ...............193
Memory Seat ........................... .120
Methanol .............................. .512
Mini-Trip Computer ...................... .316
Mirrors ................................117
Automatic Dimming .....................118
Electric Remote .........................119
Exterior Folding ........................119
Heated .............................. .120
Memory ............................. .193
Outside ..............................119
Rearview .............................117
Vanity .............................. .122
Mode Fuel Saver ........................... .314
658 INDEX
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Aging (Life of Tires).....................497
Air Pressure .......................... .487
Chains .............................. .500
Changing ............................ .543
Compact Spare ........................ .494
General Information .....................487
High Speed .......................... .490
Inflation Pressures ...................... .488
Jacking .............................. .543
Life of Tires .......................... .497
Load Capacity ........................ .482
Pressure Monitor System (TPMS) ............502
Pressure Warning Light ...................289
Quality Grading ....................... .645
Radial .............................. .490
Replacement .......................... .498
Rotation ............................. .501
Safety .............................. .475
Sizes ............................... .477Snow Tires
........................... .492
Spare Tire ............................ .544
Spinning ............................ .496
Trailer Towing ........................ .532
Tread Wear Indicators ....................496
Tire Safety Information .....................475
Tongue Weight/Trailer Weight ................529
Torque Converter Clutch ....................454
Towing ............................... .524
24-Hour Towing Assistance ................138
Disabled Vehicle ....................... .569
Guide .............................. .528
Recreational .......................... .537
Weight .............................. .528
Towing Assistance ........................ .138
T
owing Vehicle Behind a Motorhome ...........537
Traction ............................... .455
Traction Control ......................... .465
Traction Control Switch .....................465
664 INDEX