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The world's first unstealable bike can be designed around the idea of building the lock into the bike, for example in the frame. The frame's lower tube can separate and open outward, forming a pair of arms that extend enough to be placed around a solid object like a pole or bike rack. The bike's seat (with the post attached) will then be removed and inserted through the open ends of the arms to form the lock.
The integrated lock will act as a powerful theft-deterrent, since breaking the lock would also damage the frame and render the bike useless for riding.