I'm currently building a motorized Land Rider bike. It will have a Robin Subaru engine with a crank drive kit. This way I can choose between my three front chain rings and my rear sprocket will shift automatically. I saw where a 75 year old man used a GEBE system on a Land Rider; he said it worked really good. However what he has limits the engine to one gear setting on the left side of the rear wheel. Very soon I will have a video of my bike out.