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.
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.
Warning
:
The temperature grade for this tire
is established for a tire that is properly inflated
and not overloaded. Excessive speed,
under-inflation, or excessive loading, either
separately or in combination, can cause
heat buildup and possible tire failure.
5-65
Summary of Contents for 2008 Optra
Page 72: ... NOTES 1 68 ...
Page 112: ... NOTES 2 40 ...
Page 115: ... NOTES 3 3 ...
Page 116: ...Instrument Panel Overview 3 4 ...
Page 176: ... NOTES 3 64 ...
Page 202: ... NOTES 4 26 ...
Page 298: ...Engine Drive Belt Routing 5 96 ...
Page 327: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 29 ...
Page 328: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 30 ...
Page 346: ... NOTES 7 18 ...