BMW 7 Series: General Information On Light Alloy Disc Wheels

NOTE: It is sometimes difficult to distinguish light alloy disc wheels visually from steel disc wheels.

Identifying features:

• Sticker on light alloy disc wheel. (1) = Indication "Aluminium"
• Wall thickness of rim dish: approx. 8 mm.
• Light alloy disc wheels are not magnetic.
• Light alloy disc wheels can be identified from their BMW parts numbers.

Fig. 34: Identifying Light Alloy Disc Wheel Sticker

IMPORTANT:

• Use only BMW-approved two-part balancing weights.
• When fitting two-part balancing weights, always use specified tools.
• Do not straighten light alloy disc wheels: always replace damaged light alloy disc wheels.
• Notches in light alloy disc wheels can lead to cracking.
• Do not lubricate wheel nuts.
• When fitting tires, avoid damaging light alloy disc wheels, e.g. on sharpedged retaining claws on fitting machine.

INITIALIZING RUN FLAT INDICATOR (RPA)

NOTE: Checking the tire pressure is based on monitoring the speeds of the wheels in relation to each other. A tire puncture is detected and signalled by way of a deviation in specific speed ratios.

Initialization must be carried out in each case immediately after tire pressures have been corrected, after tires/wheels have been replaced and after repairs to the air spring system.

IMPORTANT: The Run Flat Indicator does not function when the vehicle is driven with the compact spare wheel.

Please refer to the relevant Owner's Handbook for details of the initialization procedure.

RDC RESETTING

NOTE: RDC monitors the tire inflation pressure in the four wheels.

Resetting must be carried out in each case immediately after tire pressures have been corrected, after tires/wheels have been replaced and after repairs to the air spring system.

Please refer to the relevant Owner's Handbook for details of the resetting procedure.

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