Saris Speed / Cadence Sensor - Dual-Antenna / Bluetooth-OperatedSaris Speed Cadence Sensor For decades cyclists have spent time meticulously lining up a speed cadence sensor with its corresponding magnet. We said enough is enough. Those minutes are better spent crushing Strava segments than crouched in the corner of the garage fidgeting with a tiny magnet. Simply install the battery, orient the sensor to program it for speed or cadence, and mount it on either the non drive side crank arm or the bikes hub, front or