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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 (1.5) 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.
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. It should be
noted that the temperature grade for this tire
is established for a tire that is properly inflated and
not overloaded. Excessive speed, underinflation,
or excessive loading, either separately or in
combination, can cause heat buildup and possible
tire failure.
5-75
Содержание 2009 Cobalt
Страница 16: ...Put someone on it Get it up to speed Then stop the vehicle The rider does not stop 1 12 ...
Страница 80: ... NOTES 1 76 ...
Страница 124: ... NOTES 2 44 ...
Страница 127: ... NOTES 3 3 ...
Страница 128: ...Instrument Panel Overview 3 4 ...
Страница 258: ... NOTES 4 42 ...
Страница 270: ...Engine Compartment Overview When you open the hood on the 2 2L L4 engine here is what you will see 5 12 ...
Страница 272: ...When you open the hood on the 2 0L L4 engine this is what you will see 5 14 ...
Страница 362: ...10 Remove all of the wheel nuts 11 Remove any rust or dirt from the wheel bolts mounting surfaces and spare wheel 5 104 ...
Страница 365: ...A Cover B Retainer C Jack and Wheel Wrench D Stow Bolt Extension Rod E Flat Tire F Bolt Base Model 5 107 ...
Страница 384: ... NOTES 5 126 ...
Страница 399: ...Engine Drive Belt Routing Dotted line shows routing for vehicles without air conditioning 6 15 ...
Страница 401: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance I or Maintenance II Services Performed 6 17 ...
Страница 402: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance I or Maintenance II Services Performed 6 18 ...
Страница 422: ... NOTES 7 20 ...