See also bike2.dk as a 'chainless electric bicycle' series hybrid bicycle drivetrain - https://www.youtube.com/watch?v=4JKOKpg21dQ&t=313s https://www.youtube.co

See also bike2.dk as a 'chainless electric bicycle' series hybrid bicycle drivetrain - https://www.youtube.com/watch?v=4JKOKpg21dQ&t=313s https://www.youtube.com/watch?v=4JKOKpg21dQ&t=313s (2016). Like others, it didn't at first make sense to me when thinking about efficiency losses and material complexity, but later realized it might have a place in certain battery-electric delivery bike applications where the majority of the power will be coming from a pre-charged battery. Think about how one could, in a worst off case, charge the bike pedaling in standsill position in a shaded area (while reading a book or using your phone) before trying to continue using the bike.