
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 mountAll Di2 components on the bicycle require the same firmware version. Using Di
Shimano Di2 Frame Junction Box

Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300. 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 mountAll Di2 componen
Shimano EW-JC304 Di2 Junction Box – 4 Ports Use With EW-SD300. Shimano Di2 Frame Junction Box
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