SHIMANO SM-JC40 DI2 External Junction Box for EW-SD50 Wires

SHIMANO SM-JC40 DI2 External Junction Box for EW-SD50 Wire

Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur, rear derailleur, cockpit junction box and battery mount.

This junction works with all Di2 with e-tube wired system components as long as firmware is updated to same version between all the connected components.

Mounts underneath the bottom bracket shell
Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/
All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
E-Tube kits, batteries, adaptors and chargers sold separately

UPC: 689228827448
Manufacturer #: ISMJC40

Description: External
Fits: EW-SD50
Model: SM-JC40
Mount: Bottom Bracket
Series: DI2
Type: Junction Box, 4-Port

Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.