Shimano Di2 SM-EW90-A Junction A

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3 port for road bikes and 5 port for Tri. 

Anything with aero shifters requires 5 port. Sprint and Climb shifters for on road drop bars plug direct to shift levers using 3 port

  • ⋅ All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
  • ⋅ Use Di2 system checker to update component firmware from
  • ⋅ SM-EW90-A 3-Port Cockpit Junction Box connects 1 pair of Di2 shifters to the frame junction box via 3 SD50 E-tube wires
  • ⋅ OEM front wiring kit for Dura-Ace Di2 9070
  • ⋅ LED battery charge level indicator
  • ⋅ Rear Derailleur adjustment mode
  • ⋅ Internal Battery charging port
  • ⋅ Includes Junction Box Band (CY9082) and Junction Box Hook (Mounting Plate, CY9081)