Campagnolo Record 11 Speed EPS Rear Derailleur. Campagnolo Record EPS is the second-lightest groupset available on the market right after Super Record EPS. The drivetrain used by professions to face the long season of great stage competitions and the classic races of the North. Electrifying performances, extreme precision and great reliability at everyone’s service. The EPS rear derailleur is comprised mainly of a mechanical structure, derived from the mechanical gear and composed of a derailleur rod/parallelogram/derailleur cage, of a worm screw enabled by an electronic actuator. As with the derailleur, the electronic rear derailleur actuator is composed of a gear motor and a sensor, the built-in resolver, that reads its movements. The geometry of the parallelogram has been made more rigid and optimised to promote interaction with the electronic parts. The rear derailleur is equipped with a play recovery system using a helicoidal spring that optimises stability and precision and keeps operation and performance constant over time, even after many kilometres have been covered.