NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes Features a portable telescoping design

Features a portable telescoping design for easy packing and breakdown

Re-tuned Charger 2 damper for next level compression and rebound control

flat edges along their backs to provide strong braking traction

plus an extra-wide PolyX breaker

but it still works with a normal freehub body and chain

NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes Features a portable telescoping designShimano 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