Abstract: A universal lock is provided for attachment to a conventional quick release mechanism of a bicycle, a bicycle carrier, or a bicycle seat post. The lock includes a conventional key operated plug lock mounted within a lock adaptor which in turn is rotatably mounted upon a lever housing. The lever housing includes an aperture for attachment of the conventional lever bore at the end of the shaft of the quick release mechanism. A camming mechanism with stop points is used to control rotation of the lock adaptor on the lever housing. In the locked position, the lever housing blocks movement of the lever arm. In the unlocked position, the lever housing may be rotated to enable operation of the lever.