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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 501
Cargo Light............................ .197
Cargo Load Floor ........................ .200
Cargo Tie-Downs ........................ .200
Car Washes ............................ .469
Cellular Phone ...........................111
Center High Mounted Stop Light ..............480
Chains, Tire ............................ .378
Changing A Flat Tire ...................... .415
Chart, Tire Sizing ........................ .358
Check Engine Light (Malfunction Indicator Light). . .442
Checking Your Vehicle For Safety ...............96
Checks, Safety ............................96
Child Restraint ............................75
Child Safety Locks .........................34
Clean Air Gasoline ....................... .390
Cleaning Wheels ............................. .470
Climate Control ......................... .295
Clock ................................. .241Clutch
................................ .462
Clutch Fluid ............................ .462
Coin Holder ............................ .196
Cold Weather Operation ....................315
Compact Disc (CD) Maintenance ..............294
Compact Spare Tire ....................... .373
Compass .............................. .226
Compass Calibration ...................... .237
Compass Variance ........................ .237
Connector UCI ............................... .286
Universal Consumer Interface (UCI) .........286
Console ............................... .196
Contract, Service ......................... .497
Coolant (Antifreeze) ...................... .481
Coolant Pressure Cap (Radiator Cap) ...........459
Cooling System .......................... .457
Adding Coolant (Antifreeze) ...............458
Coolant Level ........................ .457
506 INDEX
