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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.
IF YOU NEED CONSUMER ASSISTANCE 505
9
Brakes.............................337,462
Brake/Transmission Interlock............... 328
Break-In Recommendations, New Vehicle........ 93
Bulb Replacement....................... 482
Bulbs, Light............................ 481
Calibration, Compass..................240,246
Capacities, Fluid........................ 486
Caps, Filler
Fuel................................ 382
Oil (Engine).......................434,443
Radiator (Coolant Pressure)............... 458
Car Washes............................ 468
Carbon Monoxide Warning................. 381
Cargo Compartment
Luggage Carrier....................... 215
Cargo (Vehicle Loading)................... 214
Catalytic Converter...................... 446
Caution, Exhaust Gas.................51,95,381CD (Compact Disc) Player...............280,283
CD (Compact Disc) Player Maintenance........ 300
Cellular Phone.................104,283,284,299
Center High Mounted Stop Light............ 485
Chains, Tire............................ 367
Changing A Flat Tire..................... 412
Chart, Tire Sizing........................ 350
Check Engine Light
(Malfunction Indicator Light).............232,438
Child Restraint........................81,83
Child Restraint Tether Anchors............... 86
Child Safety Locks........................ 46
Child Seat.............................. 88
Clean Air Gasoline....................... 378
Cleaning
Wheels............................. 470
Climate Control......................... 301
Clock........................254,269,281,285
Coat Hook............................ 214
510 INDEX
