Cadillac 2011 DTS User Manual download pdf (Page 373)

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Cadillac DTS Owner Manual - 2011

All Passenger Car Tires Must Conform to Federal

Safety Requireme nts In Addition To These

Grades.

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 (1½) 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, hydroplan ing, or peak

traction characterist ics.

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 controlle d 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 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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