..to the strain on the cyclist, it has to determine how much auxiliary power is needed. For this purpose, three sensors measure speed, pedaling frequency, and torque. These allow the optimum amount of mechanical support to be computed. For example, if a head wind comes up, the e-biker must pedal harder to maintain the same speed. The pedal-force sensor reacts to this, and extra power from the motor makes up for the additional strain. This technology wastes no power, making the Bosch Drive Unit extremely efficient.
Elegantly designed, the drive can be integrated without any need to modify the wheel base extensively. Since the Bosch design positions the Drive Unit in the middle of the frame, the bike has a low center of gravity, and thus more stability