Chevrolet 1998 Cavalier Owner's Manual Page 303

  • Download
  • Add to my manuals
  • Print
  • Page
    / 400
  • Table of contents
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 302
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.
Temperature
--
A,
B,
C
The temperature grades are
A
(the highest),
B,
and
C,
representing the tire’s resistance to the generation
of
heat and its ability to dissipate heat when tested under
controlled conditions on
a
specified indoor laboratory
test wheel. Sustained high temperature can cause the
material of the tire to degenerate and reduce tire life, and
excessive temperature can lead to sudden tire failure.
The grade C corresponds to a level of performance
which all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard
No.
109.
Grades
B
and A represent higher levels
of
performance on the
laboratory test wheel than the minimum required by law.
6-45
Page view 302
1 2 ... 298 299 300 301 302 303 304 305 306 307 308 ... 399 400

Comments to this Manuals

No comments