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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 637
Checks, Safety............................110
Child Restraint............................88
Child Restraints
Booster Seats...........................92
Child Restraints.........................88
Child Seat Installation....................106
How To Stow An Unused ALR Seat Belt.......102
Infants And Child Restraints................90
Lower Anchors And Tethers For Children.......95
Older Children And Child Restraints..........91
Seating Positions........................94
Child Safety Locks.........................37
Clean Air Gasoline........................501
Cleaning
Wheels...............................597
Climate Control..........................390
Clock..................................367
Clutch.................................591
Clutch Fluid.............................591
Coin Holder.............................293
Compact Disc (CD) Maintenance..............389
Compact Disc (CD) Player...................379
Compact Spare Tire........................483
Computer, Trip/Travel......................326
Connector
UCI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..380
Universal Consumer Interface (UCI)..........380
Console, Floor...........................293
Console, Overhead........................273
Contract, Service..........................633
Coolant (Antifreeze).......................615
Coolant Pressure Cap (Radiator Cap)...........588
Cooling System...........................585
Adding Coolant (Antifreeze)...............587
Coolant Level..........................585
Disposal of Used Coolant.................589
Drain, Flush, and Refill...................585
Inspection............................58910
INDEX 643
