What alterations can result in the permit for use (Betriebserlaubnis) being cancelled?

The cancellation of the Betriebserlaubnis, or permit for use, can occur due to alterations that significantly affect the vehicle's properties or safety.

1. Fitting an engine of different power can lead to an increase in performance beyond the vehicle's original specifications, which may impact safety and emissions standards.

2. Fitting fairings can change the aerodynamics of the vehicle, potentially affecting handling and performance. Such modifications must be evaluated to ensure they don't compromise the vehicle's safety.

3. Fitting a radio, however, is generally not significant enough to cause the cancellation of the Betriebserlaubnis, as it does not alter the vehicle's fundamental attributes or safety compliance.

Understanding these distinctions is crucial to ensure compliance with German traffic laws, as certain modifications must be documented and approved to maintain the vehicle's legality on the road.