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Uniform tyre quality grading
Tyre quality grades can be found, where
applicable, marked on the sidewall of the tyre
between the tread shoulder and maximum
section width.
For example:
Treadwear 200, Traction AA, Temperature A.
However, deep tread, winter-type snow tyres
are exempt from these grading requirements
and, consequently, the tyres fitted to your
vehicle may not be marked.
Note that all passenger car tyres must
conform to federal safety requirements in
addition to the quality grades.
Treadwear:
The treadwear grade is a comparative rating
based on the wear rate of the tyre when tested
under controlled conditions on a specified
government test course. For example; a tyre
graded 150 would wear one and a half times
as well on the government course as a tyre
graded 100. However, the relative
performance of tyres depends upon the actual
conditions of use, and may depart
significantly from the norm due to variations
in driving habits, service practices and
differences in climate and road characteristics.
Traction:
The traction grades, from highest to lowest,
AA, A, B and C. These grades represent a
tyres ability to stop on wet roads as
measured under controlled conditions on
specified government test surfaces of asphalt
and concrete. A tyre marked C may have
poor traction performance.
WARNING
The traction grade assigned to this tyre is
based on straight-ahead braking tests, and
does not include acceleration, cornering,
hydroplaning, or peak traction
characteristics.
Temperature:
The temperature grades, from highest to
lowest, are A, B and C, and represent a tyres
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
temperatures can cause the material of a tyre
to degenerate, thereby reducing tyre life, and
excessive temperatures can lead to sudden
tyre failure.
Grade C corresponds to a level of
performance which all passenger car tyres
must meet under the Federal Motor Safety
Standard No 109.
Grades B and Arepresent higher levels of
performance on the laboratory test wheel than
the minimum required by law.
WARNING
Temperature grades are established using
tyres that are properly inflated and not
overloaded. Excessive speed,
under-inflation or excessive loading, either
separately or in combination, can cause
heat build-up and possible tyre failure.
19


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