Neutral for two minutes. Failure to idle
the engine after every 500 miles of
towing may cause damage to the
transmission’s internal parts.
DOT (Department Of Transportation) Qual-
ity Grades: All passenger car tires must
conform to federal safety requirements in
addition to these grades.
Quality grades can be found where appli-
cable on the tire sidewall between tread
shoulder and maximum section width. For
example:
Treadwear 200 Traction AA Temperature A
Treadwear
The treadwear grade is a comparative rat-
ing 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 one-half (1 1/2) times as well on
the government course as a tire graded
100. The relative performance of tires de-
pends upon 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 and 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 perfor-
mance.
WARNING
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests and does not include acceleration, cor-
nering, hydroplaning or peak traction
characteristics.
Temperature A, B and C
The temperature grades A (the highest),
B, and C, representing the tire’s resis-
tance 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 corre-
sponds 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
UNIFORM TIRE QUALITY GRADING
Technical and consumer information
9-17
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