and the rider can shift between the two gears by pedaling backwards slightly and then re-engaging the pedals. Of course a few compromises had to be made here. While the new freewheel is nearly as ...

When two or more gears are connected ... gear or belt to transfer motion and power while changing speed, or direction in a mechanical system. Interlock To connect or engage two or more parts ...

The system is ingenious and, as it turns out, flexible. The electric motor's speed is reduced from tens of thousands of RPM down to wheel speeds by two separate planetary gearsets on either end of ...