What technical modifications to a two-wheeler could result in the withdrawal of the vehicle’s type approval?

In German traffic rules, the type approval of a vehicle confirms that it meets safety and environmental standards in its original configuration. Technical modifications that significantly alter the vehicle's original design can lead to withdrawal of this approval.

Fitting customized handlebars changes the steering mechanism and can affect handling and safety, so it can cause the type approval to be withdrawn. Changing the wheel or tire combination affects the vehicle's stability, braking, and speedometer accuracy, which also impacts safety and compliance, leading to withdrawal.

However, installing an identical engine does not alter the vehicle’s original approved specifications, so it does not lead to a loss of type approval. Understanding this helps ensure that only modifications preserving safety and compliance are made without risking legal or insurance issues.