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Statements consisting only of original research should be removed. A bicycle lock is a security device used to deter bicycle theft, generally by fastening the bicycle to a fixed object, e. Quick-release levers – common on most bicycle wheels and seatpost fasteners – are a major challenge for theft preventions. Unless both wheels and frame are secured, wheels can be removed separately.
An optimal locking method will secure the frame as well as both wheels — either to a fixed object or to each other. Thus, like other security equipment, bicycle lockers must balance the competing interests of security, portability, and cost.