Shimano SM-JC40 Di2 External Frame Junction Box 4-Port ModelNumber=K4922 10K Temperature Compensation and Waterproof

10K Temperature Compensation and Waterproof (IPX7 waterproof to 1 meter for 30 minutes)

3/8" drive interface

10 pedal thread inserts for right crank arm

Width 2 Bolt Position Middle

} Extruded and CNC machined aluminum body

Shimano SM-JC40 Di2 External Frame Junction Box 4-Port ModelNumber=K4922 10K Temperature Compensation and WaterproofShimano SM JC40 Di2 External Frame Junction Box 4 Port. Shimano 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