More like WTF drive! All those moving levers remind me of Walschaerts valve gear on a steam locomotive. And my goodness, just watching that guy pedal makes my knees hurt. Looks like fast transitions top and bottom, sharply transitioning to a linear power stroke. Kind of an extreme oval ring, in the orientation that Chris Froome had them clocked, opposite of Biopace. But the feet aren't moving in circles, so the knee angle change would be less. Hm.
