6-54
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 AURORA 2001
Page 1: ......
Page 22: ...1 10 Put someone on it Get it up to speed Then stop the vehicle The rider doesn t stop...
Page 132: ...2 62 The Instrument Panel Your Information System...
Page 267: ...6 12 Engine Compartment Overview 3 5L V6 Engine When you open the hood you ll see...
Page 340: ...Scheduled Maintenance 7 7...
Page 341: ...Scheduled Maintenance 7 8...
Page 357: ...7 24 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED...
Page 358: ...7 25 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED...
Page 359: ...7 26 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED...
Page 360: ...7 27 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED...
Page 361: ...7 28 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED...
Page 362: ...7 29 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED...
Page 363: ...7 30 Maintenance Record DATE ODOMETER READING SERVICED BY MAINTENANCE PERFORMED...