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Compact, invisible power meter - CORIMA

Published on 16 April 2016

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MINIATURE SENSOR INSIDE BICYCLE WHEELS

Cyclists who want to know how much power they are generating with each push of the pedal can find out by mounting several sensors on their bicycles, either on the rear-wheel axis or on the pedals themselves. France-based carbon-composite bicycle component manufacturer Corima is taking this concept even further. The manufacturer’s new power sensor—developed in conjunction with Leti—is integrated into its carbon bicycle wheels, where it can measure power sight unseen.

Technology

Integrating the sensor into a carbon wheel weighing in at just 500 grams created some major challenges. The new sensor had to be both small and extremely lightweight.

Power output is calculated via indirect measurements and takes into account other factors affecting the wheel, such as the cyclist’s weight and fluctuating wheel angles due to curves or a standing pedaling posture, for instance. The measurement remains robust at temperatures ranging from -15°C to 50°C.

Leti contributed its expertise in the field of sensors, while Corima brought proven experience modelling the distribution of power through bicycle wheels. The development work also required solid know-how in electronics, signal processing, and wireless communication (to transmit data to the meter in real time).

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