CAT EYE - Bluetooth Speed and Cadence Sensor TRAIN SMARTER: Track your speed and cadence to push yourself further and achieve your fitness goals. Get ready to train harder and smarter. PRO-LEVEL ACCURACY: The Bluetooth Speed and Cadence Sensor provides the highest level of speed accuracy. COMPATIBLE: This sensor is compatible with all Bluetooth Smart cycle computers and devices. SET UP AND GO: The Bluetooth sensor comes with all required mounting hardware so you can gear up and go. FOR MOST BIKES: CatEye's speed and cadence sensors work on most road and hybrid bikes with tire sizes between 100mm and 3999mm.