- Shimano Di2 Frame Junction Box
- Connects via SD50 E-tube wires to four different points: front derailleur,
rear derailleur, cockpit junction box and battery mount
- All Di2 components on the bicycle require the same firmware version.
Using Di2 components with different firmware versions may cause malfunctions
- Use Di2 system checker to update component firmware
- Number of Ports: 2
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