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Shimano Ultegra Di2 Junction Box

Item: SH-SD50JB
SAVE 19% $24.99 $30.99
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  • EXTERNAL
    EXTERNAL
  • INTERNAL
    INTERNAL
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As an improvement over the Dura-Ace Di2 setup, the Ultegra Di2 group uses a junction box to simplify the wiring, giving you a cleaner look with easier setup. The junction box mounts under your bottom bracket shell (for external wiring) and connects the wires coming from the derailleurs, levers and battery.
  • Junction box mounts under your bottom bracket shell
  • Provides a secure, waterproof connection for your wiring
  • Compatible with externally-wired Ultegra Di2 setups
  • Not compatible with Dura-Ace Di2
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