External Junction B (SM-JC40)

The junction box SM-JC40 is used externally, when internal cable routing or an internal junction box (SM-JC41) is not possible. It is usually placed underneath the bottom bracket, fixed to the frame using a screw.

External Junction Box B - SM-JC40

Details & specifications

Shimano model codeSM-JC40
Shimano model nameJunction B (external)
Weight8 g
SeriesUltegra 6770, Ultegra 6780, Ultegra R8000, DURA-ACE 9070, DURA-ACE R9150
Downloads Junction B Manual
Buy on Amazon View on Amazon.com (opens new window)
Search on eBay Search on eBay (opens new window)

4 etube ports