Torque Sensor vs. Cadence Sensor

E-bikes rely on two types of sensors, either cadence sensors or torque sensors, to determine when to engage the motor. The choice between these sensors significantly impacts the e-bike's performance and user experience. In this article, we will explore the advantages of torque sensors and recommend upgrading certain SOBOWO models to include torque sensors.

Understanding the Difference:

Cadence Sensors: Cadence sensors detect pedal movement and are simpler in operation. They usually consist of a ring of sensors near the bottom bracket, with a magnet on one crank arm. When the magnet passes a sensor, it sends a signal to activate the motor. Cadence sensors only focus on whether the pedals are turning or not, not how hard the rider is pedaling. They often require at least a quarter-turn of the cranks to engage the motor.

Torque Sensors: Torque sensors, on the other hand, measure the force exerted by the rider on the pedals. Strain gauges, located at the bottom bracket or frame, gauge this effort and transmit the information to the controller. The motor's power output is then adjusted in proportion to the rider's pedaling effort and the chosen PAS (Pedal Assist System) level. This results in a highly responsive and seamless riding experience.

Advantages of Torque Sensors:

Instant Power: Torque sensors provide immediate motor assistance as soon as the pedals start turning. This quick response enhances the riding experience, making it feel as though the motor is reading the rider's mind.

Seamless Assistance: With torque sensors, the motor's output perfectly aligns with the rider's effort, creating a seamless and natural riding sensation. This synchronization blurs the line between the rider's input and the motor's assistance.

Fitness-Oriented: Torque sensor-equipped e-bikes are well-suited for riders with existing fitness levels or those who intend to build their physical endurance. These e-bikes require active pedaling, making for a more challenging workout.

Extended Range: E-bikes with torque sensors typically offer better energy efficiency, resulting in longer rides on the same battery size compared to cadence sensor-equipped counterparts.

Recommendation for SOBOWO E-Bike Models: We recommend upgrading select SOBOWO models, such as PowerGlide, UrbanGlide, UrbanCruiser, and TitanTrek, to include torque sensors for an enhanced riding experience.

Disadvantages of Torque Sensors:

Requires Effort: Pedaling on an e-bike with a torque sensor can be physically demanding, which may limit ride duration, especially for individuals returning to cycling after an injury or long periods of inactivity.

Constant Adjustments: Riders may experience minor speed fluctuations with each change in pedaling effort, especially at higher pedal assist levels, which might not suit everyone's preference.

Cadence Sensor Benefits:

Ease of Use: Cadence sensors make e-bikes user-friendly, as motor engagement is not dependent on pedal effort. This is beneficial for individuals who haven't ridden a bike in a while or prefer a less strenuous riding experience.

Ghost Pedaling: Cadence sensors allow "ghost pedaling," where the motor assists as long as the pedals are turning, even with minimal rider effort. This is great for riders seeking light physical activity without exertion.

Injury Recovery: Ideal for riders recovering from injuries or those with limited physical capabilities, as the e-bike can provide assistance even when the rider's legs are unable to exert significant force.

Cadence Sensor Drawbacks:

Delayed Engagement: Cadence sensors have a noticeable delay in motor engagement, which means the rider must start pedaling unassisted, potentially making starting from a standstill more challenging and strenuous.

Reduced Range: E-bikes with cadence sensors tend to consume more battery power, resulting in shorter overall range compared to torque sensor-equipped e-bikes with the same battery size.

Fitness Monitoring: Cadence sensors do not provide feedback on the rider's effort level, making it challenging for individuals with specific fitness goals to gauge their workout intensity without additional monitoring tools like fitness trackers or heart rate monitors.

In conclusion, whether it's torque sensors or cadence sensors, the best choice is the one that suits your preferences. At SOBOWO, we specialize in producing electric bikes that align with your expectations.