as an excerpt from the gearbox thread: A couple of us here, miket and others, have been working on a ratcheting CVT. Our first fully functional prototype was finished last week. It has a gear ratio from 1 to 3, and should have a completely uniform output (although we havent hooked up a DAQ system yet). video I would suggest turning down the volume, a bunch of guys start yellin halfway through... the input is not constant, so its tough to see the speed increase, especially from that angle. Its still overweight and oversized for a bicycle, but at this stage it should handle 120[ft-lbs]. So we're still happy with it.