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 the automatic activation of motor assistance while pedaling.

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

It is compatible with support standards:

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

It is mounted under the bottom bracket nut, and the disc with magnets is usually mounted instead of the smallest sprocket on the crank.

Specification:

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