Chevrolet 2006 Colorado Specifications download pdf (Page 341)

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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Chevrolet 2006 Colorado Specifications Page 341