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 departsignificantly 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.
WARNING!
The traction grade assigned to this tire is based on
straight-ahead braking traction tests, and does not
include acceleration, cornering, hydroplaning, or
peak traction characteristics.
9
IF YOU NEED CONSUMER ASSISTANCE 463
Cargo CompartmentLight ............................. 175
Cargo Light ............................ 175
Cargo Load Floor ........................ 178
Cargo Tie-Downs ........................ 179
Cellular Phone ........................ 97,274
Center High Mounted Stop Light ............ 434
Chains, Tire ............................ 339
Changing A Flat Tire ..................... 374
Chart, Tire Sizing ........................ 322
Check Engine Light
(Malfunction Indicator Light) .............202,396
Checking Your Vehicle For Safety ............. 84
Checks, Safety ........................... 84
Child Restraint .......................... 74
Child Restraint Tether Anchors ............... 78
Child Safety Locks ........................ 31
Child Seat .............................. 79
Clean Air Gasoline ....................... 350 Cleaning
Wheels ............................ 421
Climate Control ......................... 274
Clock ........................... 218,237,246
Clutch ............................... 415
Clutch Fluid ........................... 415
Coin Holder ........................... 174
Compact Disc (CD) Maintenance ............. 273
Compact Spare Tire ...................... 334
Connector UCI ........................... 260,265
Universal Consumer Interface (UCI) ....260,265
Console .............................. 174
Contract, Service ........................ 459
Coolant (Antifreeze) ................... 435,436
Cooler, Beverage ........................ 182
Cooling System ......................... 409
Adding Coolant (Antifreeze) ............. 411
Coolant Level .................... 410,413
468 INDEX
