Garmin GSC 10 Speed/Cadence Bike Sensor Cycling speed sensor for select Garmin wrist-mounted personal trainers and cycling computers Self-calibrating, wireless design measures both cycle speed and cadence in pedaling strokes per minute Provides up-to-the-minute feedback or captures results for later workout analysis Compatible with Garmin Edge 305, Edge 305CAD, and Forerunner 305 Attaches easily...