| 摘要 |
A sprocket assembly of the present invention includes a first sprocket and a bigger second sprocket. The first sprocket has a small-diametered tooth having a beveled edge. The beveled edge is tapered from a first face to a second face along a transmission direction. The second sprocket has a big-diametered tooth, which is clockwise adjacent to the small-diametered tooth having the beveled edge, having a thinner section. The thinner section is stepped at an outer face of the second sprocket. A chain of a bicycle selectively surrounds the first sprocket or the second sprocket, and a travel path thereof shifts quickly and easily via the beveled edge and the thinner section.
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