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The 12-speed wireless Di2 shifting system improves the performance of the rear derailleur without replacing the entire drivetrain. The set includes a lightweight carbon fiber rear derailleur, shift lever, battery, and charger.

• 12-speed wireless Di2 system
• Lightweight carbon fiber pulley cage
• Fast and precise upgrade to Shimano Di2 system
• Compatible with 45T and 51T sprockets
• Includes battery and charger for easy installation