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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 665
Camera, Rear........................... .284
Capacities, Fluid ......................... .648
Caps, Filler Fuel ................................ .525
Oil (Engine) .......................... .593
Radiator (Coolant Pressure) ................616
Carbon Monoxide Warning ..................116
Cargo Area Cover ........................ .315
Cargo Area Features ...................... .313
Cargo Compartment ...................... .313
Cargo Load Floor ........................ .313
Cargo Tie-Downs ........................ .314
Car Washes ............................ .623
Cellular Phone .......................... .392
Certification Label ........................ .528
Changing A Flat Tire ...................... .566
Chart, Tire Sizing ........................ .482
Check Engine Light (Malfunction Indicator Light). . .596
Checking Your Vehicle For Safety ..............115Checks, Safety
............................115
Child Restraint ............................90
Child Restraints Child Seat Installation ....................110
Install A LATCH-compatible Child Restraint . . . .106
Installing Child Restraints Using The Vehicle
Seat Belt ............................. .108
Lower Anchors And Tethers For Children .......99
Child Safety Locks .........................37
Clean Air Gasoline ....................... .521
Cleaning Wheels .............................. .625
Climate Control ......................... .393
Coin Holder ............................ .310
Cold Weather Operation ....................421
Compact Disc (CD) Maintenance ..............391
Compact Spare Tire ....................... .498
Console ............................... .310
Console, Floor .......................... .310
670 INDEX
