Gear hubs of the Nfinity group sets allow you to change the gear ratio between your pedals and rear wheel in one continuous motion. Just twist the shifter slightly on the handlebar and the gear ratio is changed to any ratio within its range. This is easy to do, no matter if you are freewheeling, pedaling under load or waiting at a stoplight.Moreover, the N330 N380 are practically maintenance-free, as they are made up of self-contained systems. They are also specially designed to withstand the high torque of an eBike and can be combined with a belt drive. See for yourself—ask your bicycle dealer about NuVinci Optimized hubs.