Pedal Assist

Pedal Assist Electric Bikes: A Complete Guide

Pedal assist, also referred to as power-assisted bicycles, is an electric bike equipped with an electric motor that provides extra support to the rider while pedaling. With a pedal assist sensor, the motor can detect the movement of the pedals and provide additional power as required. In this guide, we’ll delve into the mechanics of pedal assist electric bikes and learn how to fix any issues that may arise.

What is Pedal Assist?

Pedal assist electric bikes work by utilizing an electric motor that is activated by a pedal assist sensor. The motor provides the rider with an extra boost when they are pedaling, making it easier to travel further distances or ride uphill. Pedal assist electric bikes are particularly helpful for individuals who have difficulty keeping up with other cyclists or for those who wish to reduce the effort required during their journey.

Pedal Assist Sensor Wiring Diagram

Pedal Assist Sensor

The pedal assist sensor is an integral part of any pedal assist electric bike. It works by detecting the movement of the pedals and sending signals to the motor to adjust its speed accordingly. By doing so, it enables riders to customize their experience, deciding on the amount of support they would like at any given time. This feature is particularly beneficial for riders who want to conserve their energy or those who require assistance on particularly challenging sections of their route.

Pedal Assist Sensor Wiring & Working

There are various types of pedal assist sensors, each with its own unique wiring and working principles. Some sensors use magnets, while others use Hall effect sensors or optical detectors to sense changes in electromagnetic fields or light generated by the pedals’ movement. The motor is then activated once this information is received. Modern models of pedal assist electric bikes are also equipped with safety features such as brake lights and cutoff sensors to ensure a safe ride.

How to Fix Pedal Assist Sensor

If you experience issues with your pedal assist sensor, it’s important to diagnose the problem before attempting any repairs. If no faulty parts are found, it may just require calibration. Consult your manufacturer’s manual for instructions on how to calibrate the sensor, or take it to a professional service center for assistance. It’s recommended to bring your bike to a professional shop for more extensive repairs, unless you are qualified to undertake repairs yourself.


Pedal assist electric bikes are a great option for those who want to enjoy the benefits of cycling without the physical strain. By utilizing an electric motor and pedal assist sensor, riders can tailor their experience to their individual preferences. Understanding the mechanics of these bikes and knowing how to fix common issues can ensure a safe and enjoyable ride.