| 摘要 |
A motorcycle in which the swingarm pivot is coaxial with the sprocket shaft, and the sprocket is laterally outside the swingarm structures at the swingarm pivot. The swingarm pivot is located in the engine case, such as where the cylinder block meets the crankcase. An optional slipper clutch is located in the crankcase, such as where an upper crankcase half meets a lower crankcase half, and drives the sprocket shaft.
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