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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 AA, A, B,
and C. Those 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 performance.
IF YOU NEED CONSUMER ASSISTANCE 421
9
Caution, Exhaust Gas..................... 153
CD (Compact Disc) Player...............202,216
Cellular Phone.......................... 83
Center High Mounted Stop Light............ 391
Chains, Tire............................ 300
Changing A Flat Tire..................... 330
Chart, Tire Sizing........................ 280
Checks, Safety........................... 70
Child Restraint......................58,64,66
Child Restraint Tether Anchors.............62,64
Child Safety Locks........................ 17
Climate Control......................... 233
Clock...........................204,218,225
Compact Disc (CD) Maintenance............. 232
Compass.............................. 195
Compass Variance....................... 200
Computer, Trip/Travel.................... 195
Console, Overhead....................... 151
Contract, Service........................ 418Converter, Catalytic...................... 355
Cooling System......................... 364
Adding Coolant (Antifreeze).............. 366
Coolant Capacity...................... 392
Coolant Level......................... 367
Disposal of Used Coolant................ 367
Drain, Flush, and Refill.................. 365
Inspection........................... 364
Points to Remember.................... 368
Pressure Cap......................... 366
Radiator Cap......................... 366
Selection of Coolant (Antifreeze).........365,392
Crankcase Emission Control System.......... 357
Cruise Control (Speed Control).............. 148
Cruise Light........................... 185
Cup Holder............................ 164
Customer Assistance..................... 416
Data Recorder, Event...................... 56
426 INDEX
