Shimano SM-JC40 Di2 External Frame Junction Box 4-Port 30-80 9mm diameter seatposts with internal

9mm diameter seatposts with internal cable routing for dropper posts

Model R-Hawk Length 170mm Direct Mount/BCD OCP Configuration 1x Spindle Interface 30mm Chainline 52/55mm Material Aluminum Color Black

no UPC/EAN labeling

10-52T GX Eagle Transmission cassette

Shimano SM-JC40 Di2 External Frame Junction Box 4-Port 30-80 9mm diameter seatposts with internalShimano 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