Garmin Bike Speed & Cadence Sensor Monitor your pedaling cadence and/or speed as you ride with these easy-to-install wireless sensors. Simply attach the sensors and ride. With no magnets or other exposed parts to line up, these sensors are easy to install, maintain and move between bikes. The cadence sensor fastens to any crank arm size and measures pedal strokes per minute so you can get the most out of your training. The speed sensor attaches to the hub of either wheel and self-calibrates with your EdgeÆ to give you accurate speed and distance at all times, including indoors on the turbo trainer. Combine them both and improve your personal best or see where your stand against the pros. Compatible Devices: Fenix Fenix 2 Fenix 3 Fenix 5 Alpha 100 Approach S60 D2 Descent Mk1 Edge 1000 Edge 1030 Edge 130 Edge 25 Edge 500 Edge 510 Edge 520 Edge 800 Edge 810 Edge 820 Edge Explore 1000 Edge Explore 820 Epix eTrex Touch 35 eTrex 35 Forerunner 230 Forerunner 235 Forerunner 310Xt Forerunner 630 Forerunner 645 Forerunner 735Xt Forerunner 935 Forerunner 35 Forerunner 910XT Forerunner 920XT Instinct Oregon 600 Oregon 650 Oregon 700 Oregon 750 Tactix Varia Vision VIRB Ultra 30 VIRB X VIRB 360 Vivoactive Vivoactive 3 Vivoactive HR