2012 Shimano Di2 RD-7970 Rear Derailleur

Shimano Dura-Ace Di2 Rear Derailleurs. Fast, precise gear changing for top level riding and racing thanks to highly innovative digital technology. The carbon pulley plate is stiff and strong as metal. Weight savings and crisper shifting are the resulting benefits. Also, if the bike is dropped on its drive side, the derailleur link and motor will separate, preventing serious damage to the component.

• Di2 electronic rear derailleur (requires separate shifters, wire harness, and battery pack)
• Wide link design with an enhanced mechanism and wider gear ratio optimized for compact and standard gearing combination (no 11-28 cassettes)
• Aluminum/composite body with a carbon fiber cage assembly and 11t sealed bearing pulleys for smooth performance