Radlabor GmbH | Heinrich-von-Stephan-Str. 5c | 79100 Freiburg | Germany
www.smartfit.bike | www.radlabor.de
1.3 Measuring Principle
The pedal force measuring device is built as an own mechanical construction which is mounted
between the crank and the pedal with an 12° forward rotation about the crank.
The system determines the magnetic field variations (Hall-Effect) because of the angular
displacement (~ 1/1000mm) of a small magnet in respect to a sensor.
Due to the specific circular construction of the force transmitting elements the applied force can be
divided into a radial and a tangential part. Positive tangential force (FT = Fe) is in the pedaling
direction and positive radial force (FR = Fu) is in the centrifugal direction. This principle allows every
pedal system to be screwed on.
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