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PAS system on e-bikes: How the motor assistance really works

The PAS system (Pedal Assist System) is the heart of every e-bike. It ensures that the motor provides assistance precisely when you pedal.

By Vincent Augustin 2 minutes read time

PAS-System beim E-Bike
About the author Vincent Augustin

Vincent founded MYVELO together with Fabian. The two share a long-standing passion for cycling. Together they have cycled thousands of kilometers and fought for victories in the German racing bike league. The idea of founding MYVELO arose from their many years of experience and knowledge of what makes a good bike. Find out more about MYVELO now

Published: August 27, 2026

What is a PAS system?

Without the PAS system, there would be no "intelligent" support – the e-bike would behave more like a motorcycle with a throttle.

👉 The principle is simple: You step → Sensor detects movement → Motor provides assistance

What types of PAS systems are there?

1. Cadence sensor

The cadence sensor measures whether the pedals are turning .

Advantages:

  • Very simple and reliable

  • Perfect for beginners

  • Constant support

  • Ideal for everyday use and commuting

👉 Driving experience: pleasant, smooth, relaxed

2. Torque sensor

The torque sensor measures how hard you pedal .

Advantages:

  • Natural driving feel

  • Dynamic support

  • Higher efficiency

  • Ideal for sporty driving

👉 Driving experience: direct, precise, intuitive

How does the PAS system work in everyday use?

The PAS system runs continuously in the background and adjusts the support accordingly:

  • When starting off → gentle assistance

  • On the mountain → more power

  • At high speed → reduced support

👉 Modern systems often combine multiple sensors for a particularly harmonious driving experience.

Support levels: How much help is needed?

E-bikes offer different levels of support:

  • Eco → maximum range

  • Tour → balanced

  • Sports → strong support

  • Turbo → maximum power

👉 Tip: If you want to drive efficiently, combine low power levels with your own power output .

Which PAS system is suitable for whom?

  • Commuters & everyday drivers → Cadence sensor

  • Sporty drivers → Torque sensor

  • Touring riders → both are possible depending on preference

Conclusion: The PAS system determines the driving experience

The PAS system is crucial to how an e-bike feels:

  • Comfortable and uncomplicated

  • Or sporty and dynamic

👉 What matters is not which system is "better" – but which one better suits your driving style.

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