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PRODUCT DESCRIPTION
Shimano DI2 Ultegra Junction Box
The junction box connects the wires from the rear derailleur, front derailleur, battery, and shift levers together. There are two types, externally mounted and internally mounted to the frame.
- Joins all 4 connecting wires
- Externally mounted (Shimano Part# SM-JC40)
- Internally mounted (Shimano Part# SM-JC41)
- Weight: 10g
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