Keep track of your speed and distance with the Bike Speed Sensor from Garmin. No magnets required! This is Garmin's newest speed sensor...and it's totally awesome! Simply attach the sensor and ride...it's that easy. No magnets, and no exposed parts to line up. Just attach the speed sensor to the hub of either wheel and it self-calibrates with your Garmin ANT+ compatible device to give you accurate speed and distance at all times...including on indoor trainers. Train hard, ride fast, and win races with the Garmin Bike Speed Sensor.