1. A method for operating an electric bicycle having an electric motor and a transmission having at least two gears, the method comprising:ascertaining, at a control unit in communication with the electric motor and the transmission, an instantaneous pedal frequency, which is generated by a user of the electric bicycle;
checking, by the control unit, whether the ascertained instantaneous pedal frequency within a predetermined pedal frequency interval;
ascertaining, at the control unit, an instantaneous travel speed of the electric bicycle based on torque data or rotational speed data received from a torque sensor or a rotational speed sensor respectively, the torque sensor and the rotational speed sensor in communication with the control unit;
ascertaining, at the control unit, at least two gears of the transmission within the predetermined pedal frequency interval depending on the ascertained travel speed;
ascertaining, at the control unit, a respective power of the electric motor for each of the at least two gears ascertained;
ascertaining, at the control unit, the lowest ascertained power of the electric motor by comparing the at least two ascertained powers of the electric motor;
ascertaining, at the control unit, the gear of the transmission associated with the lower power; and
outputting, from the control unit, a signal including information associated with the ascertained gear of the transmission associated with the lower power.