| CPC B62K 11/04 (2013.01) [B62K 2204/00 (2013.01)] | 10 Claims |

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1. A two-wheeled vehicle, the two-wheeled vehicle comprising:
a frame extending along a vehicle longitudinal axis;
a swing arm journaled to the frame and adapted to support a rear wheel; and
a drive system including one or more drive sources configured to deliver a driving force to the rear wheel, wherein
the one or more drive sources include a first drive source and a second drive source,
the first drive source comprises at least one mounting portion integrally formed to at least a portion of the first drive source,
the at least one mounting portion is configured for removably mounting the first drive source on at least a portion of the swing arm, and
the second drive source is detachably mounted on the rear wheel.
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