Moinsen! YES, Sufu was tried by me and was also really helpful… now I know how to get the AI out and also know the dimensions of the gear, which probably often leads to the failure of the odometer. Diameter 7mm x 1.5mm wide, 15 teeth, module 0.4, hub/bore 3.3/1.4mm (height with hub would still be missing) As far as correct and also apply to my 850er with BC from ́96?? Other question: Is there possibly already a solution with e.g. article number at Conrad or something? Thank you, greeting, Andi