Abstract: The present invention comprises an innovative one-wheel trailer device with an included motor that is designed to be attached to a bicycle. The present invention assists a rider in the propulsion of the bicycle. The components of the present invention are to be physically located on a separate trailer which is attached to the bike, thereby reducing the weight and bulk attached to the bicycle. The present invention comprises a frame, upon which the motor, drive train and wheel are attached. The framework is designed to attach to the bicycle at each side of the rear wheel, and to the top of the seat post. The component connecting to the seat post would have a special plastic fitting that would not only prevent damage to the bicycle's frame, but would also adjust to allow for dimension variations from one bicycle to another.