Hello together. The difference is not quite clear to me between mandatory registrations and the obligation to carry an ABE. I have to take over the aluminium rims of my brother. Since these do not correspond to the standard sizes for the Golf 3, the rims must be removed from the vehicle and then registered. Why is it not enough to carry the certification of the Tüvler? Why, for example, do not have to be registered, although these restrict the visibility and Why is it enough to carry the ABE?