Patent ID: 7812713

Claim:
A device for measuring speed of a cycle, the cycle having a frame and at least one wheel fastened for rotation relative to a frame by means of a fastening axle threaded at least at one end, said device comprising: a wheel rotation detection mechanism comprising: a fixed sensor adapted to be mounted on a portion of the frame of the cycle, said sensor being adapted to detect passing of a movable sensor element fixed for movement with the wheel of the cycle and to generate a signal representative of said passing of the movable sensor element; a signal processor to process the signal generated by the fixed sensor; a screw nut internally threaded for threaded engagement with a threaded rod end of the at least one threaded end of the fastening axle of the wheel; a casing, said casing housing at least one of the fixed sensor and the signal processor, the casing being affixed to the screw nut of the fastening axle of the wheel.