Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300 MFPN=W010-1106 Sleek minimal aesthetic with a

Sleek minimal aesthetic with a functional rider tested shape

Misc 1/4 Hex Rapidator with telescopic extension

Force just got faster

Double hand-welded epoxy coated tubular 6061 T6 aluminum

Entirely new cage structure utilizing increased material structure

Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300 MFPN=W010-1106 Sleek minimal aesthetic with aShimano 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 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