Bedienungsanleitung Mercedes G-Class 2017 (Seite 265 von 286) (Englisch)

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All aboutwheels and tires

Uniform Tire QualityGrading Stand-

ards

Overview of Tire QualityGrading Stand-

ards

Uniform TireQuality Grading Standards are U.S.

governmentspecifications. Their purpose is to

providedriverswithuniformreliable information

on tire performance data. Tiremanufacturers

havetogradetires usingthree performance fac-

tors: : tread wear grade, ; traction gradeand

= temperature grade. These regulationsdonot

apply to Canada. Nevertheless, all tires sold in

North America are provided withthe corre-

sponding qualitygrading markingsonthe side-

wall of thetire.

Quality grades can be found, whereapplicable,

on thetiresidewall between tread shoulder and

maximum section width.

Example:

Treadwear grade: 200

Traction grade: AA

Temperaturegrade: A

All passenger car tires mustconformtothe stat-

utory safetyrequirements in addition to these

grades.

The actual valuesfor tires are vehicle-spe-

cific and may deviatefromthe valuesinthe

illustration.

Treadwear

The treadwear gradeisacomparative rating

basedonthe wear rateofthe tire when tested

under controlled conditionsonaspecifiedU.S.

governmentcourse. Forexample, atiregraded

150would wear oneand one-half times as well

on thegovernmentcourseasatiregraded 100.

The relative performance of tires dependsupon

theactual conditionsoftheir use, however,and

may departsignificantly from thenormdue to

variationsindrivinghabits, servicepractices

and differencesinroad characteristics and cli-

mate.

Traction

WARNING

The traction gradeassigned to this tire is

basedonstraight-ahead braking traction

tests, and does notinclude acceleration,cor-

nering, hydroplaning,orpeak traction char-

acteristics.

Avoid wheelspin. This can lead to damageto

thedrive train.

The traction grades –fromhighest to lowest–

are AA,A,Band C. Those grades representthe

tire'sabilitytostoponwet pavementasmeas-

ured under controlled conditionsonspecified

governmenttestsurfaces of asphalt and con-

crete. AtiremarkedCmay havepoor traction

performance.

The safespeedonawet,snowcovered or icy

road is always lower than on dry road surfaces.

You should pay special attention to road condi-

tionswhen temperatures are around freezing

point.

Mercedes-Benz recommends aminimum tread

depthof ã in (4 mm) on all four wintertires.

Observethe legally requiredminimum tire tread

depth(

Y page 252). Wintertires can reduce the

braking distanceonsnow-covered surfaces in

comparison withsummer tires.The braking dis-

tance is still muchfurther than on surfaces that

are noticy or covered withsnow. Takeappro-

priate carewhen driving.

Further information on wintertires (M+Stires)

(

Y page 253).

Temperature

WARNING

The temperature gradefor this tire is estab-

lished for atirethatisproperly inflated and

notoverloaded. Excessive speed, underinfla-

tion,orexcessive loading,either separately or

All aboutwheels and tires

263

Wheels and tires

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Mercedes G-Class 2017 Seite 265

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