Do you often wonder how fast you're really going when biking? Attach the Wahoo RPM Speed Sensor to your bike and accurately record your speed and distance traveled. Because the sensor weighs only 7 grams, you won't notice that it's attached to your bike. The data is sent to your compatible bike computer or sports watch with Bluetooth or ANT+. On top of that, you can send the data to apps on your smartphone, such as Wahoo Fitness, ELEMNT Companion, and Strava.