Bedienungsanleitung Mercedes GLA 2019 (Seite 321 von 346) (Englisch)

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All about wheels and tires

Uniform Tire Quality Grading Stand-

ards

Overview of Tire Quality Grading

Standards

Uniform Tire Quality Grading Standards are

U.S. government specifications. Their purpose

is to provide drivers with uniform reliable infor-

mation on tire performance data. Tire manu-

facturers have to grade tires using three per-

formance 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 applicable,

on the tire sidewall between tread shoulder

and maximum section 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-spe-

cific 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 charac-

teristics and climate.

Traction

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.

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 meas-

ured under controlled conditions on specified

government test surfaces of asphalt and con-

crete. 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 freezing

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 305). Winter tires can

reduce the braking distance on snow-covered

surfaces in comparison with summer tires. The

braking distance is still much further than on

surfaces that are not icy or covered with snow.

Take appropriate care when driving.

Further information on winter tires (M+S tires)

(Y page 306).

Temperature

WARNING

The temperature grade for this tire is estab-

lished for a tire that is properly inflated and

not overloaded. Excessive speed, underinfla-

All about wheels and tires

319

Wheels and tires

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