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.
358 IF YOU NEED CONSUMER ASSISTANCE
Ball Joints............................ 301
Battery............................... 297
Jump Starting........................ 273
Keyless Transmitter Replacement.......... 23
Location.........................274,298
Bearings.............................. 311
Belts, Drive........................... 295
Body Mechanism Lubrication.............. 301
B-Pillar Location....................... 232
Brake Assist System..................... 112
Brake, Parking......................... 222
Brake System.......................224,307
Anti-Lock........................... 225
Fluid Check......................309,334
Hoses.............................. 308
Warning Light....................... 142
Brake/Transmission Interlock.............. 221
Break-In Recommendations, New Vehicle...... 57
Bulb Replacement...................... 323
Bulbs, Light........................... 322
Calibration, Compass.................... 151
Capacities, Fluid....................... 332Caps, Filler
Fuel............................... 254
Radiator............................ 305
Car Washes........................... 312
Carbon Monoxide Warning............... 253
Cargo Tie-Downs....................... 131
Cassette Tape and Player Maintenance....... 192
Catalytic Converter..................... 296
CD Player......................159,164,175
Cellular Phone.......................... 68
Chains, Tire........................... 248
Changing A Flat Tire.................... 265
Chart, Tire Sizing....................... 229
Child Restraint...................50,52,54,55
Child Restraint Tether Anchors............. 54
Child Safety Locks....................... 19
Clean Air Gasoline...................... 251
Climate Control........................ 194
Clock................................ 158
Compact Disc Maintenance............... 193
Compact Spare Tire..................... 239
Compass............................. 150
Compass Calibration.................... 151
INDEX 363
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