Shimano Di2 Ultegra Internal Junction BoxShimano Di2 junction box is the brains of the Ultegra Di2 system. All of the component and battery wires meet here before running out to their respective components — an optional upgrade over the Dura-Ace Di2 counterpart.
- Wires use the same connector to make assembly easy
- Made to be mounted internally on frames specially designed for an internally routed system
- Weighs 10g
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