I use a Polar 710 which I think is the generation before the 720. It's totally wireless for speed, cadence and heart rate. You'll need to install sensors on your down tube or seat tube for the cadence and on your fork for for speed. A magnet will go on your wheel and one on your pedal. We use zip ties to install the sensors and the magnet on the pedal. Electrical tape under the sensors will help keep them from damaging your paint and slipping around.
V.



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