Shimano SM-JC40 Di2 External Frame Junction Box 4-Port
$39.46
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Shimano Di2 Frame Junction BoxProduct Details: All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur, rear derailleur, cockpit junction box and battery mount Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/
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