Your motorbike is fitted with a chain drive attached to the rear wheel. What do you have to be aware of when tightening the chain?

When tightening a motorbike chain, it's crucial to consider both the specifications set by the manufacturer concerning the amount of slack in the chain and ensuring the directional stability of the rear wheel.

The manufacturer's specifications for slack are important because too much slack can lead to chain slippage or derailment while too little can cause excessive wear or breakage.

Securing the directional stability of the rear wheel is essential for maintaining control over the motorbike. A properly tensioned chain affects the handling and performance of the vehicle, ensuring it operates safely.

The requirement to keep the chain grease-free during tensioning is not relevant to the tightening process itself, but rather a separate maintenance consideration to keep the chain clean for optimal performance.

Thus, options 1 and 2 are necessary to ensure safety and adherence to German traffic regulations, which prioritize vehicle safety and proper maintenance practices.