DIN 7816-4
DIN 7816-4 Rims for motorcycles and motor-scooters; part 4: divided rims (two-piece rims with divided disk)
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/1994
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/1994