Polar CS Cadence Sensor W.I.N.D for the CS600 and RS800CX
The most practical way of measuring your cycling session is with the Polar advanced wireless cadence sensor. It measures your pedaling rate as revolutions per minute in real time and average time so you can compare the technique of your ride against previous rides.
Improves your cycling technique and identifies your optimal cadence.
Interference-free cadence data lets you evaluate your individual performance.