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.
258 IF YOU NEED CONSUMER ASSISTANCE
Traction Control....................67,85,142
Trailer Towing......................... 164
Minimum Requirements................ 164
Trailer and Tongue Weight.............. 164
Warnings........................... 164
Transaxle............................. 211
Additives........................... 213
Automatic........................... 211
Filter.............................. 213
Manual..........................137,184
Selection of Lubricant.................. 212
Transmission
Range Indicator....................... 87
Transmission....................See Transaxle
Transmitter Battery Service................ 22
Transmitter, Garage Door Opener............ 70
Transmitter, Remote Keyless Entry........... 19
Transporting Pets........................ 48
Tread Wear Indicators................... 155
Trip Computer.......................... 90
Trip Odometer.......................... 88
Trunk Release, Emergency................. 24
Trunk Release Remote Control.............. 23Turn Signals.........................64,86
Underhood Fuses....................... 219
Uniform Tire Quality Grades.............. 258
Universal Transmitter.................... 70
Vacuum/Vapor Harnesses................ 209
Vanity Mirrors.......................... 56
Vehicle Identification Number............... 6
Vehicle Loading.....................147,164
Vehicle Modifications/Alterations............ 7
Vehicle Theft Alarm...................... 22
Vinyl Trim............................ 216
Viscosity, Engine Oil..................194,227
Voltmeter.............................. 86
Warning, Door Ajar...................... 17
Warning Flasher, Hazard................. 172
Warnings and Cautions.................... 6
Warranty Information.................... 254
Washers, Windshield..................65,203
Washing Vehicle........................ 215
Waxing and Polishing................... 215
272 INDEX
