6-50
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, 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
--
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.
Summary of Contents for 2002 Venture
Page 1: ......
Page 6: ...v These are some examples of vehicle symbols you may find on your vehicle ...
Page 38: ...1 32 Put someone on it Get it up to speed Then stop the vehicle The rider doesn t stop ...
Page 206: ...2 98 The Instrument Panel Your Information System ...
Page 434: ...6 62 GM Vehicle Care Appearance Materials ...
Page 453: ...Scheduled Maintenance 7 7 ...
Page 454: ...Scheduled Maintenance 7 8 ...
Page 471: ...7 25 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED ...
Page 472: ...7 26 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED ...
Page 473: ...7 27 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED ...
Page 474: ...7 28 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED ...