Shimano EW-JC302 Di2 Junction Box - 2 Ports
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Details
Shimano EW-JC302 Di2 Junction Box - 2 Ports, Use With EW-SD300
Frame 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. Using Di2 components with different firmware versions may cause malfunctions