SHIMANO Junction B Internal Wire Routing 4-Port
SM-JC41
SHIMANO - Junction B - E-TUBE - Internal DI2 Wire Routing - 4-Port

For internal DI2 wire routing, SHIMANO's SM-JC41 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-JC41 junction, which is housed inside the bike

MODEL NO    SM-JC41
SERIES    SHIMANO ULTEGRA R8050 Series
Average weight    4.1
Type    Built-in type
SD50 port (pcs)    4
SD300 port (pcs)    0
SD50 connector (pcs)    0
SD300 connector (pcs)    0
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