Speed sensor: The speed sensor has less ability to sense pedalling force and identify road conditions than the torque sensor. When Nomad detects that you are pedalling, the motor fixes the power output according to the current electronic gear. Torque Sensor: The torque sensor is the chip that controls the motor, It can determine your pedalling force as you accelerate and translate the data into an electrical signal. The motor can automatically determine the power required and deliver it to make the acceleration smoother.