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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 vehicle 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 561
Installing Child Restraints Using The Vehicle Seat
Belt..................................90
Lower Anchors And Tethers For Children .......82
Older Children And Child Restraints ..........78
Seating Positions ........................81
Child Safety Locks .........................34
Clean Air Gasoline ....................... .424
Cleaning Wheels .............................. .524
Climate Control ......................... .316
Clock .......................... .262, 282, 291
Clutch ................................ .514
Clutch Fluid ............................ .514
Coin Holder ............................ .202
Cold Weather Operation ....................337
Compact Disc (CD) Maintenance ..............315
Compact Spare Tire ....................... .407
Compass .............................. .246
Compass Calibration ...................... .258Compass Variance
........................ .258
Connector UCI................................ .306
Universal Consumer Interface (UCI) ..........306
Console ............................... .202
Contract, Service ......................... .557
Coolant (Antifreeze) ...................... .537
Coolant Pressure Cap (Radiator Cap) ...........511
Cooling System .......................... .507
Adding Coolant (Antifreeze) ...............509
Coolant Level ..................... .507, 512
Disposal Of Used Coolant .................511
Drain, Flush, And Refill ...................508
Inspection ........................... .512
Points To Remember .....................512
Pressure Cap ..........................511
Radiator Cap ..........................511
Selection Of Coolant (Antifreeze) .........508, 538
Corrosion Protection ...................... .521
10
INDEX 567
