What is the Garmin Speed Sensor 2 and Cadence Sensor 2 Bundle for?

The Garmin Bike Speed Sensor 2 and Cadence Sensor 2 Bundle gives you real wheel speed, distance, and pedal cadence from two small wireless sensors, with no magnets and nothing exposed to line up. The Speed Sensor 2 straps to the hub of either wheel and self calibrates with a compatible Garmin device, so your speed and distance stay accurate even when GPS drops out under trees or between buildings. The Cadence Sensor 2 wraps around any size crank arm on the non drive side and counts your pedal strokes per minute, the number that tells you how you are really riding.

Both sensors send live data over ANT+ and Bluetooth Low Energy, so they pair with Garmin Edge computers, most cycling watches, and indoor apps like Zwift. The speed sensor also has onboard memory that records up to 300 hours of rides on its own, then syncs to Garmin Connect the next time your phone is in range, which means a forgotten head unit does not cost you the ride. A user replaceable CR2032 battery runs about a year at an hour a day, and the rubber band mounts move from bike to bike in seconds. It is a clean, low maintenance way to add cadence to a GPS setup or lock in accurate distance for indoor training.