Looks like Curtis Odom is up to something, and it’s beyond rad! Check out this retro-direct CAD image. I can’t wait to see photos of the real thing. If you’re scratching your head or opening a new tab to “Google” retro-direct, I’ll save you the trouble. Retro-direct is a way of gearing a bicycle so that you’ll get a second speed when pedaling backwards. The technology was developed by Paul de Martin, an inventor from France.