Abstract: A bicycle lock comprising three units, namely, a ring assembly, a wire cable and a padlock. The ring assembly includes an arcuate tubular ring having a gap therein. A solid metallic rod is slidable in the ring and has a gap therein. The ring is formed on its outer contour with a slot that is closed at both ends. A stem passes through this slot and its inner end is secured to the rod which is moveable into positions either opening or closing the gap in the ring. The ring is formed with two passages either of which is adapted to receive the hasp of the padlock. A transverse bracket on the ring is attached to the frame of a bicycle wheel. The wire cable is formed with a loop at each end. One loop is permanently attached to the ring and the other loop receives a portion of the solid rod when the latter closes the gap in the ring. In unlocked position the latter loop receives the hasp of the padlock which is passed through one of said passages.