A Bontrager DuoTrap S Digital speed and cadence sensor, for use with compatible Trek bikes (please do your own research to determine compatibility with your bike). The sensor links with compatible cycle computers and transmits cadence and speed data for more accurate telemetry. The sensor has been installed in my Trek for a few years but has been little used. I'd love to see it go to a good home. It is offered in its original box, including all original wheel and crank magnets, and the original fixing bolt. It requires a CR2032 battery to operate.
