SHIMANO - Junction B - E-TUBE - External Wire Routing - 4-Port
For external DI2 wire routing, SHIMANO's SM-JC40 Junction B is the central connector for DI2 systems. Wires from the front and rear derailleurs, cockpit area, and battery all plug into the 4-port SM-JC40 junction, which is mounted under the bottom bracket.
- For external wire routing
|SERIES||DURA-ACE R9150 Series|
|SD300 connector (pcs)||0|
|SD300 port (pcs)||0|
|SD50 connector (pcs)||0|
|SD50 port (pcs)||4|