Abstract: A motorcycle conversion assembly comprises a pair of sub-frame structures to be connected to a motorcycle frame in at least three points and substantially traversing the length of the motorcycle. The conversion assembly can be disconnected by the cycle owner while maintaining the structural integrity of the motorcycle and the rear drivewheel. A pair of trailing arm structures are rotatably affixed to each of the sub-frames with bushings and extend aft of the drivewheel and each contain an additional pair of wheel hub assemblies, essentially equal in size to standard cycle tires. Lower shock absorber mounts are disposed on the trailing arms adjacent to the wheel hub assemblies to accommodate a total of four shock absorbers where the upper shock absorber mounts are affixed to the sub-frame of the conversion assembly and subsequently the motorcycle frame. Stabilizer rods laterally secure the trailing arm assemblies to the motorcycle frame.