The garmin speedcadence bike sensor is compatible with the following ant adapter for iphone edge174 500 edge174 510 edge174 520 edge174 800 edge174 810 edge174 1000 fnix174 2 fnix174 3 forerunner174 310xt forerunner174 620 forerunner174 910xt 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 edg