Abstract: The assembly of the invention provides a direct frictional drive system for a wheeled vehicle having a vehicle frame whereby at least one drive roller is in frictional contact with a vehicle wheel, which includes a hub portion having a wheel axle, a rim portion, and a tire portion having a tread surface. The assembly comprises an assembly frame structure including an upper frame portion, an upper drive roller carrier portion, and a lower wheel axle coupling portion for attaching the assembly to a hub portion of the vehicle frame. The upper frame portion is connectable to the vehicle frame and the drive roller carrier portion rotatably supports at least one drive roller in frictional contact with the tread portion. A drive motor mounted to the drive roller carrier portion rotates the drive roller when the motor is activated.