Wheel structure with integrated support ring

Emergency running system with integrated support ring 

1. Tyre
2. Support ring

Fig 1: Emergency Running System With Integrated Support Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Installation location of RDC wheel electronic unit 

1. Wheel electronic unit
2. Support ring

Fig 2: RDC Wheel Electronic Unit Installation Location

Courtesy of BMW OF NORTH AMERICA, INC.

For further information on the subject of "Tyre pressure warning systems and tires with emergency running characteristics", please refer to the vehicle Owner's Handbook. 

A BMW Parts Information bulletin will be published with information on how to order parts. 

Functional and system descriptions are not subject to change. Parts availability and immediate ordering availability cannot be derived from this information. The specialized departments will inform the markets with further details at the appropriate time.