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Shimano 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).
Frames 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 area
Note - To complete the Di2 System all items listed below are required. To maximize the performance and utilize Di2 to its fullest potential it is very highly recommended all other components(brakes/crankset/ect.) be Shimano Dura-Ace 7900 series.