Here is a differential rigged up to receive a motorcycle chain on one side and a bicycle chain on the other.Wired adapter to fix a bicycle cassette onto a standard 3/4″ keyed shaft.Bicycle cassette on 3/4″ shaft.Another view of the bicycle cassette adapter.Adapter for fixing motorcycle disc brake onto a 3/4″ shaft.Adapter for mounting a bicycle derailleur off of a custom frame.