Can't change it. Emma A 1 18 Commander is an electric bicycle, and the rear wheel is driven by a motor. Since Emma A 1 18, the conductor, did not shift gears mechanically, it was impossible to change the repair gear into a shift gear by replacing parts. However, if it is necessary to adjust the riding speed and power output more flexibly, we can consider installing a speed sensor and controller in the rear wheel or seat tube of the electric bicycle to realize the speed regulation function of the motor. In this way, it is convenient to adjust the speed when riding.