The Polar Cadence Sensor is wireless and allows you to monitor your pedal cadence as you ride. After completing the workout, download your cadence graph along with heart rate and speed graphs. Maintain the right cadence for those high spin workouts!
Features
A wireless sensor as an optional accessory for the S510, S520, S710, S710i, S720i, S725 and S625X.
It is also backwards compatable with the previous model Xtrainer Plus.