The video is indeed very nice, it shows few things [1] not mentioned on the website: - the chain is routed through the add-on device, so it should be longer th

The video is indeed very nice, it shows few things [1] not mentioned on the website: - the chain is routed through the add-on device, so it should be longer than usual - the pedals don't rotate when the chain and the wheel do, so there is a custom pedal hub with a ratchet mechanism 1. https://youtube.com/watch?v=SFsnS0Yb1Bs&t=83s https://youtube.com/watch?v=SFsnS0Yb1Bs&t=83s