Patent ID: 7101296

Claim:
A rear belt drive system for modification of the final drive ratio transferred to the rear wheel of a motorcycle, said rear belt drive system comprising: a front sprocket assembly for attachment to the transmission output shaft, said front sprocket assembly including at least one interchangeable center hub including external connecting means formed thereon, at least one interchangeable sprocket ring having a predetermined number of teeth, said at least one interchangeable sprocket ring including internal connecting means formed therein for mating engagement with said external connecting means formed on said at least one interchangeable center hub, said center hub including a peripheral flange member disposed in overlapping relation to said sprocket ring, wherein internally threaded apertures formed in said peripheral flange member receive threaded fasteners extending through said sprocket ring to detachably secure said center hub to said sprocket ring, said at least one interchangeable sprocket ring further including a plurality of annular rows of obliquely angled teeth spaced apart at regular intervals, wherein the spaces between said teeth define a plurality of annular rows of cavities, said front sprocket assembly further including a nut retainer attached to said sprocket ring by machine screws, wherein internally threaded holes formed in said sprocket ring receive said machine screws extending through said nut retainer to detachably secure said nut retainer to said sprocket ring; a rear sprocket attached to the rear wheel of the motorcycle including a plurality of annular rows of obliquely angled teeth spaced apart at regular intervals, wherein the spaces between said teeth define a plurality of annular rows of cavities; and at least one continuous drive belt having a plurality of complimentary annular rows of obliquely angled teeth formed thereon for engagement within said cavities, said at least one continuous drive belt being disposed about and engaging said front sprocket assembly and said rear sprocket such that the final drive ratio transferred to the rear wheel is modified by selective combination of said at least one interchangeable sprocket ring and said at least one continuous drive belt.