Abstract: A locking apparatus is disclosed suitable for mounting on a bicycle comprising a flexible securing member such as a cable or a chain secured to a reel at a point between the ends of the cable or chain thereby allowing the ends to be payed out or reeled in. This arrangement allows the reel and the housing over the reel if such housing is to be used to be attached to a bicycle and both can be constructed of very light weight materials. The cable or chain can be of sufficient length that it may be completely run through the back wheel, the frame and the front wheel of a bicycle and then the ends of the cable or chain secured to one another through lock receiving members at the ends thereof.