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Shimano SM JC41 Di2 Internal Frame Junction Box 4 Port MFPN=11.6818.051.001 0 Color Black Width 820 FM1749 0 Color Black Width 820 Defined Color Black Zero Friction cam surface treatment ensures smooth lever action 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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