A motorcycle engine is light, compact, efficient and develops great power for its size. It's one drawback, is that it only efficient in a narrow range of rpm. This particular characteristic of the engine, requires multiple-speed transmission be used to allow the engine to operate in its efficiency range. At Demon'â„¢s Cycle, you can find 5 and 6 speed Transmissions for your Harley. We offer custom transmissions for Harley drivelines in polished, black or natural finish here at Demons Cycle. We offer high-performance transmissions for Harley in 5-speed and 6-speed variants. We also offer left side drive and right side drive transmissions for wide tire custom Harleys and choppers.