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Shimano SM JC40 Di2 External Frame Junction Box 4 Port Length 32 CroMoly with black oxidized finish CroMoly with black oxidized finish 2 Tubeless Folding Black Shimano Di2 Frame Junction BoxFrame 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
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