Shimano SM-SJ40 4 Port Junction box

Shimano Junction Box SM-JC40 / SM-JC41 for Di2 - With 4 E-Tube connections

The Shimano junction box SM-JC40 or SM-JC41 for Di2 has four E-Tube connections and is used as the junction B mounted in the bottom bracket area. It can be used for all electronic groupsets from Ultegra Di2 6770 and before Dura-Ace R9250 or Ultegra R8150. SM-JC40 is for external, SM-JC41 for internal cable routing.

Technical Information:
Number of E-Tube Ports:
4
Number of E-Tube Connections:
0
Compatibility:
Dura-Ace Di2 9070
Dura-Ace Di2 R9150
Ultegra Di2 6770
Ultegra Di2 6870
Ultegra Di2 R8050
GRX Di2 RX815
Alfine / Nexus Di2
XTR Di2 M9050*
XT Di2 M8050*

* instead of SM-BTC1 battery mount
Features:
junction for the bottom bracket area
Models:
external:
Type:
for external cable routing (mounted on frame w/ bolts)
Type:
SM-JC40
Manufacturer Number:
I-SMJC40

internal:
Type:
for internal cable routing
Type:
SM-JC41
Manufacturer Number:
I-SMJC41
Contents:
1 x Shimano Di2 SM-JC40 junction box or SM-JC41

Weight:
universal/external: 9 g
universal/internal: 4 g