The prototype of the motor drive for an electric bicycle with speed control based on the dsPIC microcontroller, is tested under different load conditions which are fulfilled with the dynamometer. Fig. 6 shows the printed circuit board of control board for the electric bicycle designed in this paper. The motor parameters for the experiments are Kt = 0.0761021 N-m/A, JL = 0.000245 Kg m2, and BL = 0.00731 N-m s/rad. Thus, the rc can be found to be 1553 rad/sec with Kps = 5. Figure.. The magnitude frequency response of Bode plot with different Kps is shown in Fig. 7. Observing the Fig.7, it can be found that the wrc is around 800 rad/sec. It concludes that the Kps cannot be chosen less than Kps = 1. Fig. 8 shows the speed cannot reach the command speed if Kps is too small. Fig. 9 shows the step response of the speed from zero to 200 rpm under the load of 10 kg-cm. It can be observed that the motor drive can reach the command speed within the 1.5 seconds. The phase currents under the load of 10 kg-cm is shown in Fig. 10, where ch1, ch2 and math represent phase currents A, B, and C, respectively.