Tread contact area during operation must have along the overall circumference and through the whole tread width a visible tread profile with a thread depth:
For all vehicles of at least 1.0 mm.
For passenger vehicles 1.5 mm and with goods vehicles 2.0 mm.
For mopeds (motor-assisted bicycles) of at least 1.0 mm and for vehicles of all other classes at least 1.6 mm.