Abstract: A bicycle lock which can be fastened to a bicycle without any special holding device and which secures the bicycle, the seat support, and the seat is provided. The bicycle lock comprises a) a housing (2) and a drum (3) that is rotatably mounted within the housing (2), b) a cable (4) that is coiled onto the drum (3) and is directed towards the outside through an opening (6) of the housing (2). One end of the cable (4) is fixed to the drum (3) while the other end thereof, which is directed towards the outside, supports a half-lock (5a) that is connected to the half-lock (5b) disposed inside the housing (2) and can be fixed there, c) a coil spring (7) that is arranged between the housing (2) and through which the seat support (1) is guided, and e) a fastening element for fixing the housing (2) to the seat support (10).

Abstract: A bicycle lock which can be fastened to a bicycle without any special holding device and which secures the bicycle, the seat support, and the seat is provided. The bicycle lock comprises a) a housing (2) and a drum (3) that is rotatably mounted within the housing (2), b) a cable (4) that is coiled onto the drum (3) and is directed towards the outside through an opening (6) of the housing (2). One end of the cable (4) is fixed to the drum (3) while the other end thereof, which is directed towards the outside, supports a half-lock (5a) that is connected to the half-lock (5b) disposed inside the housing (2) and can be fixed there, c) a coil spring (7) that is arranged between the housing (2) and through which the seat support (1) is guided, and e) a fastening element for fixing the housing (2) to the seat support (10).