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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 and9
IF YOU NEED CONSUMER ASSISTANCE 611
LATCH Positions........................90
Lower Anchors And Tethers For Children.......89
Older Children And Child Restraints..........85
Seating Positions........................88
Child Safety Locks.........................34
Clean Air Gasoline........................471
Cleaning
Wheels...............................570
Climate Control..........................366
Automatic............................366
Cold Weather Operation....................402
Compact Disc (CD) Maintenance..............363
Compact Spare Tire........................455
Console, Overhead........................240
Contract, Service..........................607
Coolant Pressure Cap (Radiator Cap)...........560
Cooling System...........................556
Adding Coolant (Antifreeze)...............558
Coolant Capacity.......................591Coolant Level......................556, 561
Disposal Of Used Coolant.................560
Drain, Flush, And Refill...................557
Inspection............................561
Points To Remember.....................561
Pressure Cap..........................560
Radiator Cap..........................560
Selection Of Coolant (Antifreeze)......558, 591, 592
Corrosion Protection.......................568
Cruise Control (Speed Control)................187
Cupholders.............................265
Customer Assistance.......................605
Data Recorder, Event.......................81
Daytime Running Lights....................167
Dealer Service............................530
Defroster, Rear Window.....................277
Defroster, Windshield......................110
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INDEX 617
