Home page Shimano Junction-B (Di2 spec.) SM-JC41 Built-in Type

Shimano Junction-B (Di2 spec.) SM-JC41 Built-in Type


Shimano’s SM-JC41 Junction B is designed for internal DI2 wire routing, connecting front and rear derailleurs, cockpit, and battery, all housed inside the bike frame for a clean and efficient setup.

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EAN: 4524667827467 SKU: WESISMJC41 Categories: ,
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Product Description

Shimano’s SM-JC41 Junction B is a central component in DI2 systems designed specifically for internal DI2 wire routing. It acts as a critical connector, with wires from the front and rear derailleurs, cockpit area, and battery all converging at this central point. The 4-port SM-JC41 junction is strategically housed inside the bike frame to ensure a clean look and protected routing. With its primary feature focusing on internal wire routing, it enhances the overall aesthetics and efficiency of the bike’s electrical system.

Tech Specs

  • Series: DURA-ACE 9070 Series
  • Average Weight: 4.1g
  • Type: Built-in type
  • SD50 Ports: 4



Shimano, founded in Japan in 1921, is a globally recognized brand in cycling and fishing equipment. They are renowned for their precision-engineered components for bicycles, including gears, brakes, and drivetrains, with groupsets like Dura-Ace and Ultegra leading the industry. Shimano’s fishing division offers high-quality reels, rods, lines, and accessories. The brand is known for its commitment to innovation, with a focus on enhancing outdoor experiences for enthusiasts and professionals alike.