Tanto per tornare al discorso del cambio interno...secondo me integrabilissimo in un motore ebike..
https://m.pinkbike.com/news/should-the-derailleur-die-zerodes-gearbox-equipped-taniwha-review.html
https://m.pinkbike.com/news/should-the-derailleur-die-zerodes-gearbox-equipped-taniwha-review.html

