A motor and battery can be a great addition to your bike. It will allow you to go further, faster, and with less effort. You should upgrade your bike to accommodate the extra weight and torque.
While going faster is fun, eventually you will need to slow down. We recommend Tektro Dorado hydraulic brakes for both the front and back wheels. These brakes have large rotors of 180 mm or 203 mm for extra stopping power. You will feel a smooth, modulated feeling every time you press the brake lever. They both have cut-off wires that allow you to immediately turn off the motor power when you press the brakes.