Introducing the bontrager duotrap digital speedcadence sensor say goodbye to zip ties the duotrap sensor is an ant compatible 24ghz wireless sensor that fits directly into the chainstay of certain trek bicycles for a clean look that preserves aerodynamics and installs in seconds providing both speed and cadence signals the wireless system removes all clutter that you receive from cables giving your bike a clean and crisp finish overall if you have a duo trap compatible frame and a ant co