Uniform Tire Quality Grading
Quality grades can be found where applicable on the
tire sidewall between tread shoulder and maximum
selection width. For example:
Treadwear 200 Traction AA Temperature A
The following information relates to the system
developed by the Unites States National Highway Traffic
Safety Administration, 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 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.
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
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 — 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 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.
5-66
Check
Engine Light...............................................3-29
Check Engine Light.........................................3-29
Checking Coolant............................................5-27
Checking Engine Oil........................................5-13
Checking Things Under the Hood......................5-10
Chemical Paint Spotting...................................5-84
Child Restraints
Child Restraint Systems...............................1-32
Infants and Young Children...........................1-28
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-38
Older Children.............................................1-26
Securing a Child Restraint Designed for the
LATCH System........................................1-40
Securing a Child Restraint in a Rear Seat
Position..................................................1-40
Securing a Child Restraint in the Right Front
Seat Position...........................................1-43
Top Strap...................................................1-36
Top Strap Anchor Location............................1-37
Where to Put the Restraint...........................1-35
Cigarette Lighter.............................................3-18
Cleaning
Inside of Your Vehicle..................................5-79
Outside of Your Vehicle................................5-82
Underbody Maintenance...............................5-84
Weatherstrips..............................................5-81Cleaning Aluminum Wheels..............................5-83
Cleaning Exterior Lamps/Lenses.......................5-82
Cleaning Fabric/Carpet....................................5-79
Cleaning Glass Surfaces..................................5-81
Cleaning Interior Plastic Components.................5-81
Cleaning Leather............................................5-80
Cleaning the Top of the Instrument Panel...........5-81
Cleaning Tires................................................5-84
Cleaning Vinyl................................................5-80
Cleaning Windshield and Wiper Blades..............5-83
Climate Control System...................................3-19
Outlet Adjustment........................................3-22
Clutch, Hydraulic.............................................5-24
Compact Spare Tire........................................5-77
CONFIRMATION BEEPS.................................2-35
Content Theft-Deferrent....................................2-14
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-28
Cooling System..............................................5-31
COURTESY LAMP TIMEOUT...........................2-36
Courtesy Lamps.............................................3-15
Cruise Control.................................................. 3-9
Cupholder(s)..................................................2-31
Current and Past Model Order Forms................7-12
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