| 摘要 |
A sprocket wheel of a bicycle comprises a large sprocket having a plurality of teeth; a small sprocket having a plurality of teeth; and a chain. For each tooth of the large sprocket and small sprocket, a first lateral side of the tooth has a first edge line at a top end thereof; the first lateral side is cut inwards from to form as a notch; the notch is a cambered surface and a lower side of the notch is confined by a second edge line. In assembly, the first lateral side of the large sprocket is placed to be adjacent to a small sprocket so as to reduce interferences and noises in driving. The topside of the tooth has the first edge line and a third edge line; and the topside of the tooth is an inclined to a wheel surfaces.
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