$199.99
sku: BW080720-09
This external wire kit is what brings your Di2 components to life. The Di2 Rear Wire Kit, EW-7970, has long enough wires to reach the derailleurs and the battery pack. It plugs into the five-pin connector below 'Junction A' on the front harness, which plugs into the shifters. Check with Shimano to determine which wire kit length is required for your bike.