Dura-Ace Di 2 (Dual Integrated Intelligence) moves to the next generation. Tested in competition & 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 & cable to battery indicator junction box. Mount on bottom bracket cable guide threaded fitment. Water resistant. Cables sold separately.