A ridden motorized vehicle such as a motorized scooter, motorcycle, ATV, tricycle, snowmobile, or lawn tractor, having a driven rear wheel may be equipped with an enclosed chain or belt drive enclosure having a first end and a second end and an inner enclosure and an outer enclosure, such that the inner enclosure has the rear suspension member and the rear wheel mounted at the second end, and concentrically pivots at the first end on the motor assembly output shaft of a motor assembly fastened to or comprising part of the main vehicle frame, and the outer enclosure pivoted on another bearing co-linear with the motor assembly output shaft, but mounted on a removable section of, or attachment to, said frame.