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 475
Cargo Light............................ 173
Cargo Load Floor ........................ 176
Cargo Tie-Downs ........................ 176
Cellular Phone ........................ 96,270
Center High Mounted Stop Light ............ 442
Chains, Tire ............................ 349
Changing A Flat Tire ..................... 386
Chart, Tire Sizing ........................ 334
Check Engine Light
(Malfunction Indicator Light) ............... 404
Checking Your Vehicle For Safety ............. 81
Checks, Safety ........................... 81
Child Restraint .......................... 73
Child Restraint Tether Anchors ............... 77
Child Restraint with Automatic Belts ........... 76
Child Safety Locks ........................ 31
Child Seat .............................. 79
Clean Air Gasoline ....................... 361 Cleaning
Wheels ............................. 430
Climate Control ......................... 270
Clock ..................... 214,229,230,234,243
Clutch ............................... 423
Clutch Fluid ........................... 423
Coin Holder ........................... 172
Compact Disc (CD) Maintenance ............. 269
Compact Spare Tire ...................... 345
Compass Variance ....................... 210
Connector UCI ................................ 257
Universal Consumer Interface (UCI) ......... 257
Console .............................. 172
Contract, Service ........................ 471
Coolant (Antifreeze) ................... 443,444
Cooling System ......................... 417
Adding Coolant (Antifreeze) .............. 419
Coolant Level ...................... 417,421
480 INDEX
