Ford 2013 Explorer v.4 Manuel d'utilisateur télécharger pdf (Page 377)

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101

U.S. Department of Transportation-Tire quality grades: The U.S.

Department of Transportation requires Ford Motor Company to give you

the following information about tire grades exactly as the government

has written it.

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 would wear

⁄

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 climate.

Traction AA A B C

Note: 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.

The traction grades, from highest to lowest are AA, A, B, and C. The 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.

Temperature A B C

WARNING: The temperature grade for this tire is established for

a tire that is properly inflated and not overloaded. Excessive

speed, underinflation, or excessive loading, either separately or in

combination, can cause heat buildup 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. Sustained 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. 139. Grades B and A represent higher levels of

performance on the laboratory test wheel than the minimum required by

law.

376 Wheels and Tires

2013 Explorer (exp)

Owners Guide gf, 4th Printing, November 2012

USA (fus)

1 2 ... 372 373 374 375 376 377 378 379 380 381 382 ... 585 586

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Ford 2013 Explorer v.4 Manuel d'utilisateur Page 377

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