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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 performance.
9
IF YOU NEED CONSUMER ASSISTANCE 629
Warning Light........................ .313
Brake/Transmission Interlock .................420
Brightness, Interior Lights ...................243
Bulb Replacement ........................ .603
Bulbs, Light .............................111
Camera, Rear ............................270
Capacities, Antifreeze (Engine Coolant) ..........608
Capacities, Fluid ..........................608
Caps, Filler Fuel .................................497
Oil (Engine) .......................... .558
Radiator (Coolant Pressure) ................581
Carbon Monoxide Warning ..................108
Cargo Area Features .......................296
Cargo Compartment .......................296
Car Washes ............................ .589
CD (Compact Disc) Player ...................379
Cellular Phone .......................... .133Chains, Tire
............................ .481
Changing A Flat Tire .......................532
Chart, Tire Sizing ........................ .459
Check Engine Light (Malfunction Indicator Light) . .318
Checking Your Vehicle For Safety ..............107
Checks, Safety .......................... .107
Child Restraint ............................84
Child Restraints Child Seat Installation ....................102
Install A LATCH-compatible Child Restraint .....98
Installing Child Restraints Using The Vehicle
Seat Belt ............................. .100
Lower Anchors And Tethers For Children .......91
Seating Positions ........................90
Child Safety Locks .........................35
Clean Air Gasoline ........................493
Cleaning Wheels ...............................591
Climate Control ..........................390
634 INDEX
