Abstract: A bicycle frame including frame struts, an electric motor, one compartment for a power supply unit and multiple supply cables for a front light and a rear light which are fastened by a multiple-part adapter arrangement with a bicycle-side adapter part and a lighting device-side adapter part. The invention offers a new lighting concept for bikes with detachable front and rear lights by use of two adapter parts being each provided with one closure part of a multiple-part closure device, which closure parts are attachable and mechanically latchable together by means of a closing motion, wherein the closure parts each include at least one magnet element or magnet counter-element interacting in a magnetically attractive manner, when the first closure part is placed onto the second closure part, and wherein each adapter part includes non-contact or contacting coupling elements for energy transmission, which are electrically coupled in the closed position.