PAS sensor - ISIS, Hollowtech, Octalink

The cadence sensor, also known as PAS (Pedal Assistance System), is an essential component of electric bikes in Europe. It enables automatic activation of motor assistance while pedaling.

The cadence sensor consists of two parts: two magnet discs and one sensor with a mount.

It is compatible with bottom bracket standards:

• Octalink I
• Octalink II
• ISIS
• External bearings (Hollowtech cranks)
• Square

It is mounted under the bottom bracket nut, and the magnet disc is usually mounted instead of the smallest chainring on the crank.

Specification:

• Number of measurement points: 12 and 8
• Distance between the sensor and the magnet disc: approximately 1-2 mm