I have a vintage Rixe Bike, Andre Bertin model from Germany. The web doesn't have much info on Rixes, so I am documenting what I know & see. Mine has a 6V 3W 0.5A bottle dynamo light generator system. Originally, it was supposed to be split into 6V/2.4W/0.4A for the head light and 6V/0.6W/0.1A for the tail light, but by the time I acquired my bike, it no longer had a tail light. Tires: 26" x 1.75" (maybe 23-26" diameter ok). Schrader Valves.