@phooky the Retro-Direct gives you a lower gear by pedaling backwards. https://en.wikipedia.org/wiki/Retro-direct
@phooky yes it's ridable! there are two freewheels, so when pedaling forward the smaller gear is idling, pedaling backwards idles the main gear and the smaller gear is driven forward since the chain is crossed.
@th crazy! Is this meant to be an actual rideable bike?