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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 vehicle 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 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. 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 performance.
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.
Temperature Grades
The temperature grades are A (the
highest), B, and C, representing 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 corresponds to a
level of performance, which all
passenger vehicle tires must meet
under the Federal Motor Vehicle Safety
Standard No. 109. Grades B and A
represent higher levels of performance
on the laboratory test wheel, than the
minimum required by law.
Warning!
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Excessive
speed, under-inflation, or excessive
loading, either separately or in
combination, can cause heat buildup and
possible tire failure.
252
SERVICING AND MAINTENANCE
Page 287 of 300

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 performance.
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.
Temperature Grades
The temperature grades are A (the
highest), B, and C, representing 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
corresponds to a level of performance,
which all passenger vehicle tires must
meet under the Federal Motor Vehicle
Safety Standard No. 109. Grades B
and A represent higher levels of
performance on the laboratory test
wheel, than the minimum required by
law.Warning!
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Excessive
speed, under-inflation, or excessive
loading, either separately or in
combination, can cause heat buildup and
possible tire failure.
285
Page 288 of 300

INDEX
About Your Brakes...........150
ABS system ............... .112
Active Adaptive Shift (AAS) ......155
Adaptive Front Lighting System (AFS) ...................42
Additives, Fuel ..............174
Advanced Keyless Entry System Key Left In Trunk ............22
Key left In Vehicle ...........22
Locking Doors .............22
Passive Entry ..............22
Request Switch ............22
Unlocking Doors ............22
AirBag............... .133,137
Advance Front Air Bag . . . .133,137
Air Bag Warning Light .......147
Event Data Recorder (EDR) . . . .146
FrontAirBag ............ .147
Maintaining Your Air Bag
System ............... .145
Air Bag Maintenance ..........145
Air Pressure, Tires ............244
Alarm Vehicle Security Alarm ......24,25
Alarm (Security Alarm) ........24,25
Aluminium wheel maintenance . . . .257
Automatic Dimming Mirror ........37
Automatic Headlights ...........40Automatic Temperature Control
(ATC) ...................52
Automatic Transmission ........153
Auxiliary Power Outlet ..........63
B-Pillar Location.............241
Battery (maintenance) ..........235
Battery charging procedure ......236
Battery recharging ............236
Blind Spot Monitoring ..........114
Body and underbody warranty . . . .253
Body lubrication .............236
Bodywork (care and maintenance). .253
Boot, Convertible Top Lowering ....70
Boot, Convertible Top Precautions . .73
Boot, Convertible Top Raising .....72
Brake System ...............150
Brake/clutch fluid (level check) . . . .234
Brakes ............... .150,269
Bright-metal maintenance .......257
Camera, Rear..............167
Carbon Monoxide Warning ......175
Center Seat Storage Compartment. .61
Certification Label ............177
Changing A Flat Tire .....204,205,238
Checking levels ..............232
Child Restraint ..............129
Child Restraints Child Restraints ...........129
Clean Air Gasoline ............173 Climate Control
..............44
Close The Hood ..............69
Compact Spare Tire ...........249
Contract, Service ............282
Convertible Top ..............70
Convertible top maintenance .....257
Cooling Air Conditioning ............50
Cupholders .................64
Customer Assistance ..........281
Data Recorder, Event.........146
Daytime Running Lights .........40
Diagnostic System, Onboard ......77
Dimensions ............... .272
Disabled Vehicle Towing .....221,223
Driver's Seat Back Tilt ..........33
Driving in flooded area .........182
Driving tips ............... .178
Electric power steering.........74
Electric Remote Mirrors .........38
Electromagnetic Compatibility . . . .278
Electronic Brake Control System Traction Control System ......112
Electronic Speed Control (Cruise Control) ................ .158
Electronic Vehicle Information Center (EVIC)
Electronic Vehicle Information
Center (EVIC) ..............78
INDEX