I have ridden a Bonneville Flyer and an AGK 212 bike.. They are very good. There is also the Zeppo Marx Marmon motorized bicycle manufactured around the time of World War Two that has great reviews and I think Curtisfox used to own one as a youngster except it threw a rod through the case. Also Venicemotorbikes Ruff Cycle 212 build and his other 212 build with moped style hubs is probably up there too. Gilbert had a nice one. What is the best motorized bicycle ever manufactured in the world?