Got this from a coworker for cheap and decided to convert it from a 10 speed to a two speed. It's around a 85-87 huffy and was complete when I got it. I wrapped the handlebars and installed a new seat, tubes, and tires. I used an idler wheel from a bicycle engine kit to route the chain. For those of you who haven't seen a retro-direct before, you pedal forward for one gear and reverse for the other.
and a link to show you how it works. -
and a link to show you how it works. -