Uniform Tire Quality Grading
The following information relates to the system
developed by the United 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 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 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 -- A, B, C
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 concrete. A tire marked C may have
poor traction performance.
Warning: The traction grade assigned to this tire
is
based on braking (straightahead) traction tests and
does not include cornering '(turning) traction.
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Stains ...................................... 6-57
Tires ....................................... 6-62
Wheels
..................................... 6-61
Vinyl
....................................... 6-57
Windshield
and Wiper Blades ................... 6-59
Climate Control System
........................... 3-2
Clock, Setting the
............................... 3- 10
Compact Disc Care ............................. 3-32
Compact Disc Player
....................... 3-19, 3-21
Compact Disc Player Errors
............. 3-20,3-23, 3-25
Compact Spare Tire
............................. 5-34
Content Theft-Deterrent
.................... 2- 13, 2-50
Control of a Vehicle
.............................. 4-6
Convenience Net
............................... 2-57
Convex Outside Mirror
.......................... 2-54
Coolant
....................................... 6-26
Bleed Valves
................................. 5-21
Heater.
Engine ............................... 2-18
Cooling System ................................ 5-15
Courtesy Lamps
................................ 2-41
Courtesy Transportation
........................... 8-8
Cruise Control ................................. 2-35
Customer Assistance for Text Telephone Users
......... 8-5
Customer Assistance Information ................... 8- 1
Customer Satisfaction Procedure .................. 8-3
Comfort
Controls
...... ..................... 3-1
RecoveryTank
............................... 5-16
Cupholders
.................................... 2-55
Damage. Finish
..................... .... 6-62
Damage. Sheet Metal ............................ 6-62
Daytime Running Lamps ......................... 2-39 Dead Battery
....... ..... 5-3
Defects. Reporting
Safety ... .............. 8-10
Defensive Driving ............................... 4-2
Defogger. Rear Window .......................... 3-9
Defogging ..................................... 3-4
Defrosting
..................................... 3-4
Delayed Illumination
....................... 2-41. 2-45
Dimensions. Vehicle
............................ 6-73
Dolby@ B Noise Reduction .................. 3-14. 3-17
Door Locks
..................................... 2-4
Driver Information Center
........................ 2-78
DriverPosition ................................. l-14
Driver’s Temperature Knob. Automatic and
Auxiliary Temp Control
............... ....... 3-5
Driving City
........................................ 4-20
Defensive
.................................... 4-2
Drunken ..................................... 4-3
Freeway
.................................... 4-21
InaBlizzard
................................. 4-27
...........
In Foreign Countries ........................... 6-5
In the Rain .................................. 4-17
On Curves
.................................. 4-11
On Grades While Towing
a Trailer ............... 4-37
On Hill and Mountain Roads
.................... 4-23
On Snow and Ice
............................. 4-26
Through Water
............................... 4-19
WetRoads .................................. 4-17
Winter
...................................... 4-25
With a Trailer ................................ 4-36
Drunken Driving
................................ 4-3
Night
...................................... 4-16
DRL ......................................... 2-39
9-3
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