Abstract: The bicycle lock includes a housing structure secured to the frame of the bicycle under the seat adjacent to the rear bicycle wheel. A C-shaped member is pivoted to the housing structure for movement from an unlocked position to a locked position wherein the member passes under the rear tire and rim portion of the wheel. In addition, the housing includes a spring-loaded cable with one end exposed which can be pulled from the housing and looped about a stationary object such as a post and then re-inserted through an entrance opening in a side of the housing so that the wheel of the bicycle is not only locked against rotation but the bicycle itself is secured to a stationary object. A single cylinder-tumbler type key operated lock functions to simultaneously release the C-shaped member from its locked position and the one end of the cable from the entrance opening.