Abstract: The bicycle power pack consists of a frame mounting a motor and transmission mechanism, ground engaging wheels carried by an axle journaled to the frame and a hitch assembly extending forwardly from the frame and attachable to the bicycle rear axle. In order to prevent weight transfer from the power pack to the rear axle of the bicycle, the center of gravity of the power pack is located directly above the axle, thus improving the stability and maneuverability of the bicycle and power pack combination.

Abstract: A device for propelling a bicycle or the like comprising in combination, a frame having wheels and an overlying cargo carrier instrumentality, a power pack disposed thereon adapted to drive said wheels, hitching instrumentalities connecting said frame to the bicycle rearwardly thereof, and suspension instrumentalities disposed between said wheels and said frame whereby road irregularities and the like are absorbed by said suspension instrumentalities and in part by said hitching instrumentalities, said hitching instrumentalities providing the bicycle a complete normal range of motion.