Dura-Ace Di2 (Dual Integrated Intelligence) moves to the next generation. Tested in competition and taken to victory by pro riders in all conditions, including the 2012 Tour de France Team Sky. SM-JC40 cable junction for external wire routing. Key Features: Required for connection of rear mech, front mech, battery and cable to battery indicator junction box. Mount on bottom bracket cable guide threaded fitment. Water resistant. Cables sold separately.

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