Bicycle, has magnet moved with rotation of crank axle, and circular aperture formed in region of magnet during fastening of magnetic ring at side of chain wheel, where side of chain wheel is turned away from bicycle frame
摘要
<p>The bicycle has a magnet (71) provided at a hall sensor (6) and moved with rotation of a crank axle (3). A magnetic ring is selectively fixed at a carrier of a chain wheel (5) or at an opposite end of the crank axle. A circular aperture is formed in a region of the magnet during fastening of the magnetic ring at a side of the chain wheel, where the side of the chain wheel is turned away from a bicycle frame (1). The circular aperture is provided into a middle of the magnetic ring, where the magnetic ring and the hall sensor are retrofitted.</p>
