Emergency Running Systems

Emergency running systems

Introduction

Tyres with emergency running characteristics can still be used for a certain distance even if they suffer a complete loss of pressure. There are two different systems which meet these requirements:

- emergency running system with self-supporting tyres
- emergency running system with integrated support ring


Emergency running systems setup

Emergency running system with self-supporting tyres

The side walls of the self-supporting tyre are reinforced. In conjunction with a special disc wheel the tyre can still be used for a certain distance even if it suffers a complete loss of pressure.

Mobility is retained for the following distances up ton speed of 80 km/h (50 mph) nod with a cautious suitably adapted driving style:
Unloaded vehicle max. 500 km (300 miles)
Unloaded roadster less than 250km (150 miles)
Fully loaded vehicle max. 50 km (30 miles)

Self-supporting tyres demand permanent monitoring of the tyre pressure to ensure that the driver is given adequate warning if pressure is lost during a journey. For this reason these tyres are only available in conjunction with the warning system RDW and from 03/2000 also with RDC.

To prevent the self-supporting tyres from becoming detached from the disc wheel in the event of a complete loss of tyre pressure they must be fitted to newly developed wheels with modified disc wheel humps but with unchanged tyre seating (standard disc wheel).

However the new wheels can also be used for standard tyres of the same size.