Manual Mercedes AMG GT Roadster 2018 (page 275 of 294) (English)

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tors: : 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 corre-

sponding quality grading markings on the side-

wall 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 stat-

utory 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, however, and

may depart significantly from the norm due to

variations in driving habits, service practices

and differences in road characteristics and cli-

mate.

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 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 surfaces.

You should pay special attention to road condi-

tions 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 262). Winter tires can reduce the

braking distance on snow-covered surfaces in

comparison with summer tires. The braking dis-

tance is still much further than on surfaces that

are not icy or covered with snow. Take appro-

priate care when driving.

Fur

ther i

nformation on winter tires (M+S tires)

(

Y page 263).

Temperature

WARNING

The temperature grade for this tire is estab-

lished for a tire that is properly inflated and

not overloaded. Excessive speed, underinfla-

tion, or excessive loading, either separately or

in combination, can cause excessive heat

build-up and possible tire failure.

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. Sus-

tained 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.

All about wheels and tires

273

Wheels and tires

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Mercedes AMG GT Roadster 2018 Manual

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