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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 393
Car Washes............................ .354
Cellular Phone .......................... .180
Certification Label ........................ .267
Chains, Tire ............................ .253
Chart, Tire Sizing ........................ .231
Check Engine Light (Malfunction Indicator Light) ............147, 329
Checking Your Vehicle For Safety ...............86
Checks, Safety ............................86
Child Restraint ............................61
Child Restraints Booster Seats ...........................66
Child Restraints .........................61
How To Stow An Unused ALR Seat Belt ........75
Infants And Child Restraints ................64
Older Children And Child Restraints ..........64
Cigar Lighter ........................... .134
Clean Air Gasoline ....................... .261Cleaning
Wheels .............................. .356
Climate Control ......................... .181
Manual ............................. .181
Cold Weather Operation ....................200
Compact Spare Tire ....................... .248
Contract, Service ......................... .389
Coolant Pressure Cap (Radiator Cap) ...........347
Cooling System .......................... .343
Adding Coolant (Antifreeze) ...............345
Coolant Capacity ...................... .374
Coolant Level ......................... .348
Disposal of Used Coolant .................347
Drain, Flush, and Refill ...................344
Inspection ........................ .343, 348
Points to Remember .....................348
Pressure Cap ......................... .347
Radiator Cap ......................... .347
Selection of Coolant (Antifreeze) ......344, 374, 375
398 INDEX
