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Internal Junction B (SM-JC41)

The junction box SM-JC41 is used inside the frame, for internal wire routing. Not all frames will accommodate an internal junction B. The alternative is to either use the external junction box SM-JC40, or not use a junction B at all.

Details & specifications

Shimano model codeSM-JC41
Shimano model nameJunction B
Weight4 g
SeriesUltegra 6770, Ultegra 6780, Ultegra R8000, DURA-ACE 9070, DURA-ACE R9150
Downloads Junction B Manual
View on Amazon (new tab)  |  eBay (new tab) Chain Reaction Cycles (new tab)

Shopping links

Are you looking to upgrade your bike using this component? We've added shoppings links to this component's Amazon and eBay pages. Click the images below to view the Amazon product page or eBay search results.

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SM-JC41 installation