Chevrolet ENCLAVE - NAVIGATION SYSTEM 2008 Spezifikationen PDF herunterladen (Seite 369)

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.

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.

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.

Warning: 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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