Shimano EW-JC304 Di2 Junction Box with 4 Ports for E-Tube Electronics Brand_Delta maximizing pedaling efficiency across various

maximizing pedaling efficiency across various mountain biking platforms

allowing unrestricted movement during intense activities

and avid riders seeking advanced technology and innovative features

Constructed from high-grade three-layer webbing

Shimano EW-JC304 Di2 Junction Box with 4 Ports for E-Tube Electronics Brand_Delta maximizing pedaling efficiency across variousShimano 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