Manual Mercedes S-Class Coupe - 2015 (page 372 of 402) (English)

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All about wheels and tires

Uniform Tire Quality Grading Stand-

ards

Overview of Tire Quality Grading Stand-

ards

Uniform Tire Quality Grading Standards are

U.S. government specifications. Their pur-

pose is to provide drivers with uniform relia-

ble information on tire performance data. Tire

manufacturers have to grade tires using three

performance factors: : tread wear grade, ;

traction grade and = temperature grade.

These regulations do not apply to Canada.

Nevertheless, all tires sold in North America

are provided with the corresponding quality

grading markings on the sidewall of the tire.

Quality grades can be found, where applica-

ble, on the tire sidewall between the tread

shoulder and maximum tire width.

Example:

Treadwear grade: 200

Traction grade: AA

Temperature grade: A

All passenger car tires must conform to the

statutory safety requirements in addition to

these grades.

The actual values for tires are vehicle-

specific and may deviate from the values in

the illustration.

Treadwear

The treadwear grade is a comparative rating

based on the wear rate of the tire when tested

under controlled conditions on a specified

U.S. government course. For example, a tire

graded 150 would wear one and one-half

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, how-

ever, and may depart significantly from the

norm due to variations in driving habits, ser-

vice practices and differences in road char-

acteristics and climate conditions.

Traction

WARNING

The traction grade assigned to this tire is

based on straight-ahead braking traction

tests, and does not include acceleration, cor-

nering, hydroplaning, or peak traction char-

acteristics.

Avoid wheelspin. This can lead to damage

to the drive train.

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.

The safe speed on a wet, snow covered or icy

road is always lower than on dry road surfa-

ces.

You should pay special attention to road con-

ditions when temperatures are around freez-

ing point.

Mercedes-Benz recommends a minimum

tread depth of ã in (4 mm) on all four winter

tires. Observe the legally required minimum

tire tread depth (Y page 357). Winter tires can

reduce the braking distance on snow-covered

surfaces in comparison with summer tires.

The braking distance is still much further than

370

All about wheels and tires

Wheels and tires

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Mercedes S-Class Coupe - 2015 Manual

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