Mercedes Benz 2008 GL 320 CDI User Manual download pdf (Page 387)

386

Operation

Tires and wheels

Tread depth

Do not allow your tires to wear down too

far. Adhesion properties on wet roads are

sharply reduced at tread depths of less

than

1

/

8

in (3 mm).

Treadwear indicators (TWI) are required by

law. These indicators are located in six

places on the tread circumference and

become visible at a tread depth of approx-

imately

1

/

16

in (1.6 mm), at which point the

tire is considered worn and should be re-

placed.

Recommended minimum tire tread depth:

앫 Summer tires

1

/

8

in (3 mm)

앫 Winter tires

1

/

6

in (4 mm)

1 TWI (T

read Wear Indicator)

The treadwear indicator appears as a solid

band across the tread.

Storing tires

Cleaning tires

Warning! G

Although the applicable federal motor safety

laws consider a tire to be worn when the

treadwear indicators (TWI) become visible at

approximately

1

/

16

in (1.6 mm), we recom-

mend that you do not allow your tires

to wear down to that level. As tread depth

approaches

1

/

8

in (3 mm), the adhesion

properties on a wet road are sharply

reduced.

Depending upon the weather and/or road

surface (conditions), the tire traction varies

widely.

!

Keep unmounted tires in a cool, dry place

with as little exposure to light as possible.

Protect tires from contact with oil, grease and

gasoline.

!

Never use a round nozzle to power wash

tires. The intense jet of water can result in

damage to the tire.

Always replace a damaged tire.

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