How to Upgrade Your Ride: Putting an Electric Motor on Your Bike
To put an electric motor on a bike, first choose the type of motor and battery you want to use and purchase them. Remove the pedals, bottom bracket, and chain from your bike and install the motor and battery mount on the frame. Connect the motor to the battery and install a throttle or pedal-assist sensor. Finally, connect the motor to the rear wheel with a chain or belt drive, and test the system to ensure it is working properly before riding.