The Bontrager DuoTrap is an integrated speed and cadence sensor that fits directly into the chainstay of compatible Trek frames, keeping the lines of the bike clean and the aerodynamics intact. It transmits both ANT+ and Bluetooth Smart signals, so it can talk to a bike computer and a phone at the same time.

• ANT+ 2.4 GHz and Bluetooth Smart wireless digital speed and cadence sensor
• Simultaneous transmission to a computer and a smartphone
• Works with any ANT+ or Bluetooth Smart enabled device
• Includes wheel magnet, crank cadence band and CR2032 battery
• Installs into the chainstay of select Trek bicycles in seconds
• Trek part number 508126

Please check frame compatibility before ordering — this is the original DuoTrap fitment, not the later DuoTrap S.