What is the maximum permissible wear measured across the diameter of the towing ring of a drawbar?

The maximum permissible wear on the towing ring of a drawbar is 1.0 mm across its diameter. This limit ensures that the towing ring remains strong and safe during use. If the wear exceeds this value, the towing ring could weaken and potentially fail, leading to dangerous driving situations. German traffic regulations set this limit to maintain vehicle safety when towing. By checking that the wear does not exceed 1.0 mm, you help ensure the towing connection is secure and reliable.