Made exclusively for Ultegra 6770-Di2 electronic shifting systems. The junction box is what ties the whole system together.
Each bike will need cockpit area cable SM-EW67 and the following from the junction box: (1) to front derailleur, (1) to battery, (1) to rear derailleur, and (1) to cockpit area. (Please consult Shimano.com for proper measuring information)
4 connector junction box for internal cable frames.
Because some frame manufacturers use custom junction boxes for their frames please consult with them before installation.
7970-Di2 and 6770-Di2 cables are not compatible
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