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

You selected 1.5 mm, which is correct. According to German regulations, the maximum permissible wear across the diameter of the towing ring of a drawbar is 1.5 mm. This is important because excessive wear can compromise safety by weakening the connection between the towing vehicle and the trailer. Always check that the wear does not exceed this limit to ensure road safety and compliance during inspections.