Shimano SM-JC41 Di2 Internal Frame Junction Box 4-PortShimano Di2 Frame Junction Box Product 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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