The focus of this work is to develop a new powertrain for an electric bike. A typical electric bike ranging 60KM per full charge will take more than 3 hours to charge and limited availability of public space makes it difficult to install charging stations. In the present work, a powertrain is proposed for electric bike which has its own power generation system. An axial flux alternator is coupled to pedal and whenever the pedaling action in performed, the alternator produces power to recharge battery and run the hub motor of the electric bike at the same time. Hence, the electric bike does not require any charging station and will be environmentally friendly. The mathematical modelling of the proposed electric powertrain was developed and simulated using MATLAB. The respective results of the simulation were discussed in this paper. © 2023 Author(s).