BMW 760i Bedienungshandbuch PDF herunterladen (Seite 193)

Mobility

191

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Temperature

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. 109. Grades B and A repre-

sent higher levels of performance on the

laboratory test wheel than the minimum

required by law.

The temperature grade for this tire is

established for a tire that is properly

inflated and not overloaded. Excessive

speed, underinflation, or excessive load-

ing, either separately or in combination,

can cause heat buildup and possible tire

failure.<

Run-flat tires

You will recognize run-flat tires by a circular

symbol containing the letters RSC on the

side of the tire, refer to page 193.

M+S

Winter and all-season tires.

These have better winter properties than

summer tires.

Tire condition

Inspect your tires frequently for tread wear,

signs of damage and for foreign objects

lodged in the tread. Check the tread depth.

Tire tread

The tread depth should not fall below e in/

3 mm.

At tread depths below e in/3 mm, there is

an increased risk of high-speed hydroplan-

ing, even when only small amounts of

water are present on the road surface.

As winter tires display a noticeable loss in

their ability to cope with cold-weather driv-

ing conditions once the tread wears to

below k/K in/4 mm, to ensure continued

safety you should always have such tires

replaced.

Wear indicators at the tread-groove base,

refer to arrow, are distributed over the tire's

circumference and are marked on the side

of the tire with TWI – Tread Wear Indicator.

These indicators signal at a tread depth

of k/FK in/1.6 mm that the legally permitted

wear limit has been reached.

Tire damage

Unusual vibrations encountered dur-

ing normal vehicle operation can

indicate tire failure or some other vehicle

defect. This can, for example, be caused

by driving over curbs.

These kinds of problems may also be

signaled by other changes in vehicle

response, such as a strong tendency to

pull to the left or right. Should this occur,

respond by immediately reducing your

speed. Carefully proceed – or have your

vehicle towed – to the nearest BMW center

or tire dealer to have the wheels or tires

inspected.

Tire damage, extending to sudden and

complete loss of pressure in extreme

cases, can pose a potentially lethal safety

hazard for the vehicle's occupants and

other road users alike.<

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