Bedienungsanleitung Tesla Model S 2015 (Seite 147 von 164) (Englisch)

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Uniform Tire Quality Grading

The following information relates to the tire

grading system developed by the National

Highway Traffic Safety Administration

(NHTSA), which grades tires by tread wear,

traction and temperature performance. Tires

that have deep tread, and winter tires, are

exempt from these marking requirements.

Where applicable, quality grades are found on

the tire’s sidewall between the tread shoulder

and maximum section width. For example:

• TREADWEAR 180

• TRACTION AA

• TEMPERATURE A

The quality grades are described next.

Note: In addition to the marking requirements,

passenger car tires must conform to Federal

Safety Requirements.

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 wears one and

a half times better on a government test

course than a tire graded 100. The relative

performance of tires depends on the actual

conditions of their use, however, and can

depart significantly from the norm due to

variations in driving habits, service practices,

road characteristics, and climate.

Traction

The traction grades, from highest to lowest,

are: AA, A, B, and C. These grades represent a

tire’s ability to stop on wet pavement as

measured under controlled conditions on test

surfaces of asphalt and concrete. A tire

marked C might have poor traction

performance.

Warning:

Defective tires are dangerous.

Do not drive if a tire is damaged,

excessively worn, or is inflated to an

incorrect pressure. The safety of the

vehicle and occupants can be adversely

affected. Check tires regularly for wear

and to ensure there are no cuts, bulges or

exposure of the ply/cord structure.

Warning: The traction grade assigned to

the tire is based on straight-ahead

braking tests, and doesn’t include:

acceleration, cornering, hydroplaning or

peak traction characteristics.

Temperature

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 tire to degenerate and reduce tire

life, and excessive temperature can lead to

sudden tire failure.

The grade C corresponds to the minimum

level of performance that all passenger car

tires must meet under the Federal Motor

Safety Standard No. 109. Grades B and A

represent levels of performance on the

laboratory test wheel that exceed the

minimum requirements.

Warning: A tire’s temperature grade is

established for a tire that is properly

inflated and not overloaded. Excessive

speed, under-inflation, or excessive

loading, either separately or in

combination, can cause heat buildup and

possible tire failure.

Wheels and Tires

Specifications 147

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Tesla Model S 2015 Seite 147

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