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 (straight ahead) traction tests and does not
include cornering (turning) traction.
Tires ....................................... 6-49
Vinyl
....................................... 6-46
Wheels
..................................... 6-49
Windshield and Wiper Blades
................... 6-47
Climate Control System
........................... 3-2
Clock. Setting the
................................ 3-6
Comfort Controls
................................ 3-2
Compact Disc Care
............................. 3-20
Compact Disc Player
............................ 3- 1 1
Compact Disc Player Care ........................ 3-20
Compact Spare Tire
............................. 5-36
Control of a Vehicle
.............................. 4-6
Convex Outside Mirror
.......................... 2-42
Coolant Heater. Engine
............................... 2-17
Surge Tank Pressure Cap
....................... 6-25
Cooling System
................................ 5-17
Courtesy Transportation
........................... 8-6
Cruise Control
................................. 2-33
Cruise Light
................................... 2-59
Customer Assistance Information
................... 8- 1
Customer Satisfaction Procedure .................... 8-2
SurgeTank
.................................. 5-17
Customer Assistance for
Text Telephone Users ......... 8-4
Damage. Finish
............................... 6-50
Damage. Sheet Metal
............................ 6-50
Daytime Running Lamps
......................... 2-38
DeadBattery
................................... 5-3
Defects. Reporting Safety ..................... 8.8. 8.9 Defensive Driving
............................... 4-2
Defogger. Rear Window
.......................... 3-5
Defogging
..................................... 3-4
Defrosting ..................................... 3-4
Dimensions. Vehicle
............................ 6-59
Dolby
B Noise Reduction ........................ 3-14
DoorLocks
..................................... 2-4
Driver Position
................................. 1 . 12
Driving
City
........................................ 4-20
Defensive
.................................... 4-2
Drunken
..................................... 4-3
Freeway
.................................... 4-21
InaBlizzard
................................. 4-27
In Foreign Countries
........................... 6-5
IntheRain .................................. 4-17
Night
...................................... 4-15
OnCurves
.................................. 4-10
On Grades While Towing
a Trailer ............... 4-38
On Hill and Mountain Roads
.................... 4-23
OnSnowandIce
............................. 4-26
Throughwater
............................... 4-19
WetRoads .................................. 4-17
Winter
...................................... 4-25
With a Trailer
................................ 4-37
Drunken Driving
................................ 4-3
Electrical Equipment. Adding
..... 2- 15. 2- 16. 3-19. 6-52
Electrical System
............................... 6-52
9-3
