A hybrid bicycle is provided which can be manually propelled, but which includes a motor unit for also causing forward propulsion of the bicycle. The bicycle comprises manually operable pedals fixed for rotation with a pedal spindle for receiving a manually provided driving force and a motor having a shaft for receiving a motor provided driving force. A first torque transmission path is provided for transferring the manually provided driving force to a sprocket of the pedal driven apparatus and a second torque transmission path is provided for transferring the motor provided driving force to said sprocket of the pedal driven apparatus. A first one way drive means is also provided. This is provided in the first torque transmission path between the pedal spindle and the sprocket such that when the sprocket is being driven by the motor provided driving force through the second torque transmission path, the pedal spindle is able to freewheel. The second torque transmission path may include a gear mechanism mechanically coupling the motor shaft to the sprocket of the pedal driven apparatus. The gear mechanism has a reduction gear ratio and operates to transfer the motor provided driving force from the motor shaft to the sprocket at said reduction gear ratio. The motor may be arranged concentrically around a pedal spindle of the pedal driven apparatus such that the pedal spindle is freely accommodated through a hollow bore of the motor shaft and such that their axes of rotation are parallel and preferably co-incident.