How do I choose a torque transducer on my e-bike?

Choosing the right torque sensor for your e-bike is an important step in enhancing your riding experience. In this article, you will learn all you need to know about torque for your e-bike motor. We will discuss how much torque is needed for an e-bike.

What is torque?

Simply put, torque is a physical quantity that describes the force of rotation and indicates the ability of an acting force to rotate an object around an axis. On an e-bike, torque is usually measured in Nm (New Meters) and indicates the amount of force that the motor is capable of delivering when driving the bike. Higher torque means the e-bike will be more powerful when starting, climbing hills or carrying heavy loads.

How does torque affect my e-bike?

Torque directly affects the acceleration and hill climbing ability of your e-bike.
Starting Acceleration: High torque motors can provide a quick start, especially when starting at a stoplight or when you need to accelerate quickly.
Climbing ability: If you often ride on hills or slopes, an e-bike with high torque is able to accomplish climbing tasks more easily.
Load performance: When you're carrying cargo or carrying a passenger, a high-torque motor can effectively maintain a stable ride.

What is the difference between torque and wattage?

Many people confuse torque and wattage, but they are actually two different concepts.
Torque: The rotational force of a motor's output, which mainly affects the vehicle's ability to start and climb hills.
Wattage: represents the power of the motor, i.e. the rate of energy consumption when the motor is running, which determines the top speed and endurance of the e-bike.
In other words, torque focuses more on power, while wattage favors speed and energy consumption.

How much torque do I need for my e-bike?

The torque you need depends on your riding scenario and needs:
Daily commuting: 30-50Nm of torque is usually enough if you ride mainly on flat city roads.
Mountain or suburban riding: In environments with undulating terrain, choosing a torque of 60Nm or more will result in a better riding experience.
Heavy load transportation or passenger carrying: higher torque is required, 70Nm or above is recommended.

Is a torque sensor worth it?

A torque sensor is a device that senses the force applied by the rider and adjusts the motor output according to how hard you pedal, providing a more natural and smooth riding experience. Here are some of the pros and cons:
Pros:
Natural feel: the torque sensor makes the riding experience closer to that of a traditional bicycle.
Power Saving: Intelligently adjusts motor power based on pedaling effort to extend battery life.
Ride control: excels in scenarios that require precise output control (e.g. mountain riding).
Disadvantages:
Higher price: torque sensors cost more than simple speed sensors.
Complicated maintenance: requires more precise tuning and maintenance.
If you're focused on riding comfort and efficiency, especially in complex terrain, then a torque sensor is well worth the investment.

Final Thoughts

Choosing the right torque sensor requires a combination of your riding needs and budget. Torque determines how powerful an e-bike feels, and pairing it with a smart torque sensor can take your riding experience to the next level. Whether you're a daily commuter or pushing the limits, knowing these details will help you better choose the right e-bike configuration for you.