Torque Sensors Explained

A torque sensor reads how hard you push. That's the main difference from a sensor that only counts pedal turns.¹

Torque means twisting force. On a bike, it's the force you put through the pedals and cranks. It's the "force" half of what a pedal-assist bike can detect.¹

The rest of this page sticks to what the saved sources actually say. Where they stay silent, so does this page. Short and simple. Your maker's own description, whether in the manual, on the spec sheet or on the support page for your model, is the place to look for anything more than that.

Where the sources say it can sit

One source lists several places a force reading can come from: the pedals, the pedal crank, the chain, or the wheel.²

It also gives two more specific examples. Force can be measured by torque sensors near the crankset, or with strain gauges on the axles of hub motors.²

A strain gauge is a small part that reacts when metal flexes. The source doesn't go into how, so this page won't guess. What matters for a buyer is simple. Torque sensing can be built into different parts of different bikes.

Not new technology

Torque sensors and power controls were developed during the late 1990s. A Japanese patent from that period describes a torque sensor zero point adjusting mechanism.¹

You don't need that history to use a bike. It does show that the idea has been around a while.

Force, speed, or both

Makers can build assist around force, around pedaling speed, or around both together. The listed options for switching or controlling the motor include measuring force or torque, measuring pedaling speed, and measuring both force and speed.²

Some models even allow manual switching from torque to speed control. If your bike offers that, the manual for your model explains it.²

How it relates to the support level

The power supplied also depends on the support level you pick, usually in several levels from zero to maximum.² So a torque sensor gives the controller your effort, and your chosen level sets the rest.

What this page can't tell you

The sources here don't say how a torque-sensing bike feels to ride. They don't say it's smoother, quieter or better on hills. Any claim like that would need a maker's own description.

It also can't tell you which of these designs your bike has. That's a question for the manual. Don't guess from the look of the frame.

If you're comparing bikes, look for the maker's description of what the bike measures. The comparison page lines up the two types.

Don't open a motor housing to look at the sensor. Follow your own manual or a qualified e-bike mechanic. Nothing on this page is a repair guide, and none of it replaces what the maker says about your model.