Eerily similar in appearance to the first-generation carbon fiber Record rear derailleur. In fact, that's basically what the Chorus rear derailleur is -- one generation bygone Record, minus the super-light alloy hardware. From a performance perspective, it's Record-quality through and through. As with the current Record rear derailleur, the Chorus version comes with new pulleys designed to increase the quietness of the drivetrain. Silence is bliss. So is crisp shifting. 202g.