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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 577
Installing Child Restraints Using The Vehicle Seat
Belt..................................84
Lower Anchors And Tethers For Children.......77
Older Children And Child Restraints..........72
Seating Positions........................76
Using The Top Tether Anchorage.............88
Clean Air Gasoline........................427
Cleaning
Wheels...............................525
Climate Control..........................314
Automatic............................314
Cold Weather Operation....................352
Compact Spare Tire........................410
Console, Overhead........................198
Contract, Service..........................573
Coolant Pressure Cap (Radiator Cap)...........515
Cooling System...........................511
Adding Coolant (Antifreeze)...............513
Coolant Capacity.......................548
Coolant Level..........................512
Disposal of Used Coolant.................516
Drain, Flush, and Refill...................512
Inspection............................516
Points to Remember.....................516
Pressure Cap..........................515
Radiator Cap..........................515
Selection of Coolant (Antifreeze).............512
Corrosion Protection.......................523
Cruise Control (Speed Control)................158
Cupholders.............................215
Customer Assistance.......................571
Customer Programmable Features.............250
Data Recorder, Event.......................68
Daytime Brightness, Interior Lights.............147
Daytime Running Lights....................141
Dealer Service............................494
Deck Lid, Emergency Release.................4110
INDEX 583
