Bmw 750i Sedan 2006 Bedienungsanleitung PDF herunterladen (Seite 200)

Wheels and tires

198

Temperature

The temperature grades are A, B, and C, A

being highest, and represent the tire's resis-

tance 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 Vehi-

cle Safety Standard No. 109. Grades B and A

represent 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 loading, either sep-

arately or in combination, can cause heat

buildup and possible tire failure.<

RSC 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 199.

M+S

Winter and all-season tires.

These have better winter properties than sum-

mer tires.

XL

Indicates specially reinforced tires.

Tire condition

Inspect your tires frequently for tread depth,

signs of damage and for foreign objects lodged

in the tread. Check the tread depth.

Minimum tread depth

The tread depth should not fall below 0.12 in/

3 mm, although, for example, European legisla-

tion only specifies a minimum tread depth of

0.063 in/1.6 mm.

At tread depths below 0.12 in/3 mm, there is an

increased risk of high-speed hydroplaning,

even when only small amounts of water are

present on the road surface.

Winter tires display a noticeable loss in their

ability to cope with cold-weather driving condi-

tions once the tread wears to below 0.16 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 circum-

ference and are marked on the side of the tire

with TWI – Tread Wear Indicator. If the tire tread

has been driven down to the wear indicators, a

tread depth of 0.063 in/1.6 mm has been

reached.

Wheel/tire damage

Please note that low profile tires make wheels,

tires, and suspension parts more susceptible to

road hazards and consequential damages.

Unusual vibrations encountered during normal

vehicle operation can indicate tire failure or

some other vehicle defect. This can, for exam-

ple, 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.

In these cases, reduce speed immedi-

ately and have wheels and tires thor-

oughly checked. Drive carefully to the nearest

BMW center or tire shop that works according

to BMW repair procedures with correspond-

ingly trained personnel. If necessary, have the

vehicle towed there.

Tire damage can be extremely dangerous for

vehicle occupants and other road users.<

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