See also:

Using the SmartKey
– Turn the SmartKey to position 0 in the ignition lock and remove it. The immobilizer is activated. If you turn off the engine with the SmartKey and then remove it from the ignition lock ...

Rim
This is the part of the wheel on which the tire is mounted. ...

Stowing a used collapsible spare wheel
Take the following steps to stow a used collapsible spare wheel. It will otherwise not fit in the spare wheel well. Mercedes-Benz recommends that you have this work carried out at a qualified spec ...