|English: Design of a gearing system. (Photo credit: Wikipedia)|
I wish I had the editorial staff of Bike Rumor, or at least the time to prowl the internet looking for cool bicycle stuff. This link comes via Bike Rumor. It’s a two-speed retro-direct drive. I have heard of these, but someone decided to bring them back with the help of 3D printing. What can’t those printers do? Oh yeah, retro-direct drive is basically a two speed where you pedal backwards to use the higher second gear.
Don’t try to wrap your head around that right away, you might pull something. Click on the link, or look at the pictures before you blow your mind.