While automatic gear-shifting for bikes isn't unheard of, such setups typically require batteries that have to be frequently recharged. This is not the case with Shimano's new Q'Auto system ...

ADO has co-developed a hub motor with Bafang that sports 3-speed auto-shifting gears. The first model to roll with this system is the Air 30 Ultra city ride, which also comes with a 100-km battery ...