Shimano 7970-Di2 EW-7970 REAR Wire Harness Kit
The Dura Ace Di2 Rear harness kit comes from the bottom bracket to connect the battery, front derailleur and rear derailleur to the front wire harness kit . You'll need this kit to install your Di2 7970 components. This external cable is available in five sizes. Please click on "images" to determine the size you need.
Battery cradle comes with rear wire harness but battery sold separately
Frame sizing for rear wire kits: most frames will utilize a medium kit.
Note: In order to find a specific size, please contact your frame company!