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DOT Tire Quality Grading (U.S. Vehicles)
The tires on your vehicle meet all
U.S. Federal Safety Requirements.
All tires are also graded for
Treadwear
Traction
The treadwear grade is a compara-
tive rating based on the wear rate of
The traction grades, from highest to
lowest, are AA, A, B, and C. Those
treadwear, traction, and temperature
performance according to
the tire when tested under controlled grades represent the tire’s ability to
conditions on a specified government stop on wet pavement as measured
test course. For example, a tire
Department of Transportation
(DOT) standards. The following
explains these gradings.
under controlled conditions on
specified government test surfaces
of asphalt and concrete. A tire
marked C may have poor traction
performance.
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 depends upon the actual condi-
tions 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.
Uniform Tire Quality Grading
Quality grades can be found where
applicable on the tire sidewall
between tread shoulder and
maximum section width. For
example:
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.
Treadwear 200
Traction AA
Temperature A
All passenger car tires must conform
to Federal Safety Requirements in
addition to these grades.
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