Campagnolo Chorus 2×12 Speed Rear Derailleur RD20-CH12 Made in Italy. The Chorus rear derailleur benefits from the same technology and design of top-end Campagnolo products, incorporating the sophistication and performances of the 12-speed Super Record and Record. With just a few changes in the materials used for its construction, like the external plate and derailleur cage in aluminum, the Chorus…