Chevrolet 2009 Silverado 1500 Pickup Spezifikationen PDF herunterladen (Seite 497)

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101

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 (1.5) 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.

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. It should be

noted that the temperature grade for this tire

is established for a tire that is properly inﬂated and

not overloaded. Excessive speed, underinﬂation,

or excessive loading, either separately or in

combination, can cause heat buildup and possible

tire failure.

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