Pedal assist bikes use a sensor to detect pedalling and tell the motor when to help. Cadence sensors detect pedal movement, while torque sensors measure the force you apply.
An e-bike sensor tells the motor when to help. A cadence sensor detects the pedals turning. A torque sensor also measures how hard you push.
That can change how assistance feels when you start, cruise or climb a hill. The bike's motor and software also affect the result, so a test ride matters.
How do pedal assist bikes use cadence and torque sensors?
Cadence means how fast you turn the pedals. A cadence sensor detects that movement. The bike then supplies assistance according to your selected level and the way the system is set up.
A torque sensor detects the effort you put through the pedals. The controller can use that information to adjust the motor's help as your effort changes. Some systems combine several sensors. Ask which system is fitted to the exact model you are considering.
For more detail, see pedal assist bikes.
How they can feel when riding
| Situation | Cadence-based assistance may feel like | Torque-based assistance may feel like |
|---|---|---|
| Starting | Assistance begins once pedal movement is detected | Assistance responds as pedal force is applied, subject to the control logic |
| Easy cruising | A selected assist level helping while the pedals turn | Assistance varying more closely with your effort |
| Climbing | Selecting more support while keeping the pedals moving | More support as you push harder, within system limits |
| Slow manoeuvres | Low assist settings and predictable control are important | Pressure on a pedal can affect the assistance request |
These are tendencies, not promises about every bike. Sensor resolution, motor response, software, gearing and brake cut-offs can make two cadence bikes feel different from each other, just as two torque-sensing bikes can.
Which feel do you prefer?
If you want the assistance to rise and fall with your effort, try a torque-sensing bike. If you prefer help while you keep the pedals turning lightly, try a cadence-sensing bike. Compare starts, slow turns and hills to see which feels easier to control.
Do not assume a torque sensor is automatically more powerful, or that cadence sensing is inherently crude. Motor power and maximum torque are separate specifications. The useful question is whether the bike responds in a way you can predict and control.
For more detail, see 250W vs 500W motors.
Four things to try on a test ride
First, start in the lowest appropriate assistance level. Notice how much pedal movement or effort is needed before help arrives, and whether the transition feels smooth to you. Repeat the start without chasing speed.
Second, coast and then resume pedalling. Check whether assistance returns progressively and whether the selected level feels appropriate. Third, try a permitted gentle incline and compare how the bike responds when you contribute more effort or change gears.
Finally, practise a slow turn and a controlled stop in a clear area. Follow the retailer's instructions for brake cut-offs and controls. Keep a hand ready on the brakes, and do not experiment with unfamiliar high-assist behaviour in traffic or near pedestrians.
For more detail, see book a test ride with a DiroDi dealer.
You still need to change gears
Motor assistance does not eliminate the need to choose a comfortable bicycle gear. Starting in an unnecessarily high gear makes the first pedal movement harder. Shifting before a stop can help you restart more comfortably.
On a rear-hub bike, the rider's bicycle gears do not change the motor's internal gear ratio. Their role is to help your own contribution. On a mid-drive system, motor drive passes through the bicycle drivetrain, which makes gearing relevant in a different way. Avoid carrying advice from one arrangement to another without checking the system.
What the sensor label cannot tell you
A torque sensor does not certify public-road legality. Neither does a cadence sensor make a bike non-compliant. The complete bike must meet the applicable requirements for its power, assistance behaviour and construction, and the rider must meet local rules. See the Australian e-bike classification guide.
It also does not tell you battery range by itself. Riding style and the amount of assistance requested affect consumption. Without a controlled comparison, a claim that one sensor guarantees a particular percentage improvement would be misleading.
For more detail, see battery voltage and capacity.
Questions to ask about your chosen model
- Which sensor system is fitted to this exact generation and variant?
- How does assistance start and stop, and which controls should I learn first?
- Can I test the bike at low speed and on a representative hill?
- Is the motor a rear-hub or mid-drive arrangement?
- What checks are required if assistance feels delayed, inconsistent or different from normal?
Contact DiroDi with the model name rather than assuming all bikes in a family share the same sensor. If your current bike behaves unexpectedly, stop and ask for diagnosis; do not alter hidden controller settings to compensate.
For more detail, see DiroDi Rover Pro.
Frequently asked questions
What are pedal assist bikes?
Pedal assist bikes use a motor to help while the rider pedals. A sensor tells the system when assistance is needed, while the selected mode controls its response. Public-use requirements also depend on the complete bike and local rules; the words pedal assist alone do not prove road eligibility.
What is the difference between torque and cadence sensors?
A cadence sensor detects pedal movement, while a torque sensor measures force applied through the pedals. Their riding feel also depends on the controller and its settings. Try starts, slow turns, hills and stopping on the actual bike rather than choosing solely from the sensor label in a specification.
Does a torque sensor automatically give more range?
No sensor type guarantees a fixed increase in riding distance. Assistance settings, battery energy, hills, load, tyres and your pedalling all affect energy use. Compare equivalent bikes on a familiar route, and choose the response that feels predictable and comfortable for the riding you actually plan to do.
Pedal Assist Bikes: Torque vs Cadence Sensors