Racers pedal at around 90rpm, commuters pedal around 60rpm. Small generators are not efficient until 5000rpm or so, so this will need a two or three stage pla

Racers pedal at around 90rpm, commuters pedal around 60rpm. Small generators are not efficient until 5000rpm or so, so this will need a two or three stage planetary gear to increase the rpm by about 100x. Each stage loses around 3%, so that's at least 6% gone before we even get to the electrical losses. I think this system will end up only being 80-85% efficient pedals to wheel. On a manual bike you really notice a 5% efficiency change, like after you clean and oil your chain. On a electric bike I doubt you would notice.