Colorado Cyclist
Shimano SM-JC41 Di2 Internal Frame Junction Box 4-Port
- Colorado CyclistUp to 80% off through Dec 31$38Buy
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From Colorado Cyclist
Shimano Di2 Frame Junction Box 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 Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/