Wahoo RPM Speed Sensor
For tracking your cycling speed and recording other speed data, the RPM Speed Sensor by Wahoo makes it easy. Simply mount the sensor on any front wheel hub, connect it to your smartphone or GPS bike computer and go. The lightweight sensor gathers the information and sends it to your chosen device via Bluetooth 4.0 and ANT + dual band technology. The battery is replaceable and no magnets are required to mount it. The Wahoo RPM Speed Sensor is also waterproof up to 5ft, making it a great companion in any weather.