Uniform Tire Quality Grading
Quality grades can be found where applicable on
the tire sidewall between tread shoulder and
maximum section width. For example:
Treadwear 200 Traction AA Temperature A
The following information relates to the system
developed by the United States National Highway
Traffic Safety Administration (NHTSA), which
grades tires by treadwear, traction, and
temperature performance. This applies only to
vehicles sold in the United States. The grades are
molded on the sidewalls of most passenger car
tires. The Uniform Tire Quality Grading (UTQG)
system does not apply to deep tread, winter-type
snow tires, space-saver, or temporary use
spare tires, tires with nominal rim diameters
of 10 to 12 inches (25 to 30 cm), or to some
limited-production tires.
While the tires available on General Motors
passenger cars and light trucks may vary with
respect to these grades, they must also conform
to federal safety requirements and additional
General Motors Tire Performance Criteria (TPC)
standards.
Treadwear
The treadwear grade is a comparative rating based
on the wear rate of the tire when tested under
controlled conditions on a speci ed government
test course. For example, a tire graded 150 would
wear one and a half (1.5) 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 signi cantly from the norm due to variations
in driving habits, service practices, and differences
in road characteristics and climate.
Traction – AA, A, B, C
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 speci ed 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.
369
Climate Control System............................... 168
Air Filter, Passenger Compartment........... 173
Outlet Adjustment..................................... 172
Clock.......................................................... 216
Collision Damage Repair............................. 437
Comfort Guides, Rear Safety Belt................. 37
Compact Spare Tire.................................... 385
Compass..................................................... 197
Content Theft-Deterrent............................... 107
Control of a Vehicle..................................... 252
Convenience Net......................................... 145
Coolant
Engine Temperature Gage........................ 184
Engine Temperature Warning Light........... 183
Heater, Engine......................................... 115
Cooling System........................................... 326
Courtesy Lamps.......................................... 163
Cruise Control............................................. 157
Cruise Control Light.................................... 189
Cupholder(s)................................................ 144
Customer Assistance Information
Courtesy Transportation........................... 434
Customer Assistance for
Text Telephone (TTY) Users................. 430
Customer Assistance Offices.................... 430Customer Assistance Information (cont.)
Customer Satisfaction Procedure.............. 426
GM Mobility Reimbursement Program...... 431
Reporting Safety Defects to
General Motors..................................... 441
Reporting Safety Defects to the
Canadian Government.......................... 441
Reporting Safety Defects to the
United States Government.................... 440
Roadside Assistance Program.................. 432
Service Publications
Ordering Information.............................. 441
D
Daytime Running Lamps/Automatic
Headlamp System.................................... 162
Defensive Driving........................................ 248
Delayed Entry Lighting................................ 164
Delayed Exit Lighting................................... 165
Delayed Headlamps.................................... 162
DIC Compass.............................................. 197
Disc, MP3................................................... 236
Doing Your Own Service Work.................... 297
Dome Lamp................................................ 164
448
