DEPARTMENT OF TRANSPORTATION UNIFORM
TIRE QUALITY GRADES
The following describes the tire grading categories estab-
lished by the National highway Traffic Safety Adminis-
tration. The specific grade rating assigned by the tire's
manufacturer in each category is shown on the sidewall
of the tires on your car.
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 con-
ditions on a specified government test course. For ex-
ample, a tire graded 150 would wear one and a half (1
1/2) 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
characteristics and climate.
Traction Grades
The traction grades, from highest to lowest, are A, B, and
C, and they represent the tire's ability to stop on wet
pavement as measured under controlled conditions on
specified government test surfaces of asphalt and con-
crete. A tire marked C may have poor traction perfor-
mance.
WARNING!
The traction grade is based on braking (straight-
ahead) traction tests and does not include cornering
(turning) performance.
Temperature Grades
The temperature grades are A (highest), B, and C, repre-
senting the tire's resistance to the generation of heat and
its ability to dissipate heat when tested under controlled
conditions on a specified indoor laboratory test wheel.
Sustained high temperature can cause the material of the
tire to degenerate and reduce tire life, and excessive
temperature can lead to sudden tire failure. The grade C
IF YOU NEED CONSUMER ASSISTANCE 257
9
Traction Control....................70,87,144
Trailer Towing......................... 166
Minimum Requirements................ 166
Trailer and Tongue Weight.............. 166
Warnings........................... 166
Transaxle............................. 213
Additives........................... 215
Automatic.......................... 213
Filter.............................. 215
Manual..........................139,186
Selection of Lubricant.................. 214
Transmission
Range Indicator....................... 89
Transmission....................See Transaxle
Transmitter Battery Service................ 18
Transmitter, Garage Door Opener............ 73
Transmitter, Remote Keyless Entry........... 15
Tread Wear Indicators................... 157
Trip Computer.......................... 92
Trip Odometer.......................... 89
Trunk Release, Emergency...............20,21
Trunk Release Remote Control.............. 20
Turn Signals.........................67,88Underhood Fuses....................... 223
Uniform Tire Quality Grades.............. 257
Universal Transmitter.................... 73
Vacuum/Vapor Harnesses................ 211
Vanity Mirrors.......................... 58
Vehicle Identification Number............... 6
Vehicle Loading........................ 149
Vehicle Modifications/Alterations............ 6
Vehicle Theft Alarm...................... 19
Vinyl Trim............................ 218
Viscosity, Engine Oil..................196,232
Voltmeter.............................. 88
Warning, Door Ajar...................... 14
Warning Flasher, Hazard................. 174
Warnings and Cautions.................... 6
Warranty Information.................... 254
Washers, Windshield..................68,205
Washing Vehicle........................ 217
Waxing and Polishing................... 217
Wheel Alignment and Balance............. 158
Wind Buffeting......................... 22
270 INDEX
