The EW-RS910 E-Tube Di2 Internal Junction-A is the key element for connecting your Shimano Di2 drivetrian. It mounts in either a bar end or, in the case of some frames, in purpose-built ports in order to connect Di2's disparate bits and provide a conveniently accessible charging port.

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E-TUBE Junction A - Built-in type for frame or handlebarDesigned for use as a bar-end on drop handlebars or with designated frames, the RS910 junction is a 2-port option for internal E-TUBE wire routing, charging, battery monitoring, and shift mode switching.

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Shimano's E-Tube Di2 Junction Box (also known as the B junction) connects all your component and battery wires to make assembly much easier. It's a crucial item along with the five required wire sections to operate your Ultegra 6770, Ultegra 6870, or Dura-Ace 9070 Di2 shift system. The E-Tube Di2...

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We love the reliability, customization, and shifting precision offered by a wired Di2 setup. Every once in a while during a bike build or gruppo swap between frames, we'll run into a Di2 wire that comes up just a little too short. The EW-JC200 is a female-to-female junction box that allows...

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The Shimano E-Tube Di2 Wire plays an integral and important role in assembling your 6770, 6870, or 9070 Di2 group. Without it, you can't install your Di2 derailleurs, shifters, or battery. So, check the size chart on this page for length, and don't worry about the rest. If you're running Ultegra...

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Available in three separate lengths for your exact frame needs, the Shimano E-Tube Di2 Y-Split Rooting connects your Di2's battery to the front and rear derailleurs. This E-Tube Y-Split Rooting is compatible with all previous Di2 drivetrain generations, regardless if they're Ultegra or Dura-Ace....

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With the release of Shimano's updated Dura-Ace and Ultegra 12-speed Di2 drivetrains comes a new e-tube wire that's based on technology developed for Shimano's industry-leading e-bike systems. The SD300 wire is more compact and lightweight than previous e-tube wires, and it comes in a wide variety...

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Perhaps our favorite function with Di2 is shifting the front derailleur. It's light years better than any mechanical group and Shimano brings reliable Di2 technology and performance to Ultegra for precise and effortless shifting. This latest Di2 version is the R8050 and it's 11-speed compatible....

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SHIMANO SM-GM02 oval rubber grommets secure internally routed E-TUBE wires as they enter the bicycle frame.

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Shimano's refinements to the latest Ultegra Di2 group are truly remarkable, and while we always fancy a full Dura-Ace build, we'd be hard pressed to decipher a difference in performance. That makes sense since Ultegra gets Dura Ace trickle down technology, and for rear derailleurs, the RD-R8050...

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