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Tread wear
The tread wear 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 one-half
(11/2) times as well on the government course as a tyre graded 100. The relative performance of tyres 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
The traction grades, from highest to lowest, are AA, A, B, and C. Those grades represent the tyre’s ability to stop
on wet pavement 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 traction tests, and does not include
acceleration, cornering, hydroplaning, or peak traction characteristics.
Temperature
The temperature grades are A (the highest), B, and C, representing the tyre’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 tyre to degenerate and reduce tyre life, and
excessive temperature can lead to sudden tyre failure. The grade C corresponds to a level of performance,
which all passenger car tyres must meet. Grades B and A represent higher levels of performance on the
laboratory test wheel than the minimum required by law.
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