A security system for use with bicycles. The security system includes a tube having two tube halves attached to the down tube of a bicycle and includes two movable arms adapted to releasably hold onto an existing structure. An electromagnet is also attached to the tube for releasably attaching to metallic structures. The two arms and electromagnet can be controlled using a remote control fob or cell phone. A surface detection sensor attached to the handlebars of the bicycle is also employed to locate the bicycle in the event of theft.

A security system for use with bicycles. The security system includes a tube having two tube halves attached to the down tube of a bicycle and includes two movable arms adapted to releasably hold onto an existing structure. An electromagnet is also attached to the tube for releasably attaching to metallic structures. The two arms and electromagnet can be controlled using a remote control fob or cell phone. A surface detection sensor attached to the handlebars of the bicycle is also employed to locate the bicycle in the event of theft.

A multi-diameter clamp for clamping on tires of different sizes is provided. The multi-diameter clamp comprises at least one clamping unit, at least one actuator, and at least one sensing unit. The at least one clamping unit further includes at least one movable member and a fixed member. Wherein the at least one movable member moves within a tire housing space having a starting position and a clamping position. The tire housing space locates between the movable member and the fixed member for clamping on a tire. The at least one actuator connects to the at least one movable member, and enables the at least one moveable member to move between the starting position and the clamping position. The at least a sensing unit obtains a diameter size of the tire, and based on the diameter size, actuates the at least one actuator corresponding to the diameter size.

The present invention is a security system for use with an ordinary bicycle. The Bicycle Security System of the present invention allows users: to leave their bicycle anywhere without the need to be tethered to an existing stationary support, eliminates the use of chaining systems that are easily cut off, comes equipped with a security system which offers a user peace of mind, and is easily locked and unlocked with a fob-lock system. The present invention employs a key-fob lock system which actuates a locking mechanism located on the down tube of a bicycle. A surface detection sensor attached to the handlebars of the bicycle is also employed to locate the bicycle in the event of theft.