| Shimano Di2 Junction-B Box / Extenal & Internal |
 This Shimano Di2 Junction-B Box is required for all parts of the Shimano Di2 System. It enables Di2 compatible components to communicate with each other. Tech Specs: The Frame Junction Box connects via SD50 E-Tube wires to four different points: Front derailleur, rear deailleur, cockpit junction box, and battery mount How to measure a frame for SD50 E-Tube wires - Click Here Type Box: EXT = External (4-Port) Junction Box attaches to the outside of the bottom bracket shell INT = Internal (4-Port) Junction Box is meant to be hidden inside the frame Note: All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions. Shipping Weight: 1.0 lbs. Price: 30.99 |