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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.
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IF YOU NEED CONSUMER ASSISTANCE 547
Clean Air Gasoline........................410
Cleaning
Wheels...............................512
Climate Control..........................302
Clock..................................248
Clutch.................................501
Clutch Fluid.............................501
Coin Holder.............................202
Cold Weather Operation....................323
Compact Disc (CD) Maintenance..............301
Compact Spare Tire........................393
Compass...............................232
Compass Calibration.......................244
Compass Variance.........................244
Connector
UCI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..293
Universal Consumer Interface (UCI)..........293
Console................................202
Contract, Service..........................543
Coolant (Antifreeze).......................526
Coolant Pressure Cap (Radiator Cap)...........498
Cooling System...........................495
Adding Coolant (Antifreeze)...............497
Coolant Level..........................495
Disposal Of Used Coolant.................499
Drain, Flush, And Refill...................496
Inspection............................499
Points To Remember.....................500
Pressure Cap..........................498
Radiator Cap..........................498
Selection Of Coolant (Antifreeze)............496
Corrosion Protection.......................509
Cruise Light.............................218
Cupholders.............................202
Customer Assistance.......................541
Data Recorder, Event.......................76
DealerService............................482
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INDEX 553
