Shimano EW-JC304 Di2 Junction Box with 4 Ports

Description

Shimano Di2 Frame Junction Box

FEATURES:

• 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

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