SHIMANO DI2 REAR WIRE KITShimano Di2 Dura-Ace Rear Derailleur Wiring kitShimano Di2 Electronic shifting rear derailleur wiring kit. Available in three lengths as well as an internal routing kit. Kits includes bracket for battery (sold separately).Lengths Small 770mm Medium 830mm Large 890mmFrames with internal cable routing requires the internal kit.EW-7973 allows for front internal routing and rear external routing. Use EW-7973 if any of the following apply.1 – You have a closed BB construction (bb does not have any openings into chainstay/down tube/seat tube)2 – If you want to run the cable external on the chain stay/BB areaNote – To complete the Di2 System all items listed below are required. To maximize the performance and utilize Di2 to its fullest potential itis very highly recommended all other components(brakes/crankset/ect.)be Shimano Dura-Ace7900 series.Di2 Dura-Ace Controls or (Di2 Dura-Ace TT/Tri Brake Lever & Di2 Dura-Ace TT/Tri Bar-End Shifters)Di2 Dura-Ace Rear DerailleurDi2 Dura-Ace Front DerailleurDi2 Dura-Ace Front Wire KitDi2 Dura-Ace BatteryDi2 Dura-Ace Battery ChargerDi2 Dura-Ace Charger Cable
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