The garmin bike cadence sensor crank mounted monitor your performance as you ride with this easy to install wireless cadence sensor garmin bike cadence sensor crank mounted features the cadence sensor fastens to any size crank arm and tracks pedaling strokes per minute so you can train for your optimal performanced compatible with the edge 1000 810 800 510 500 910 xt 310 xt as well fr610 and fr70 series watch units pack includes cadence sensor cadence sensor straps manual