Garmin Speed sensor 2 & cadence sensor 2 - measurement and storage of speed, cadence, distance via ANT+ or Bluetooth LE. Mount on wheel hub. : Amazon.co.uk: Sports & Outdoors
Edge 1000 - Installing the Speed Sensor
Garmin Speed Sensor 2
Garmin Speed Sensor 2 | The Pro's Closet
Garmin Bike Speed Sensor Black 010-12103-00 - Best Buy