Shimano Di2 E-Tube Junction Box A (5 Port)

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This is the Shimano DI2 Dura-Ace E-Tube Junction Box. This box is referred to as the junction Box A  and is located at the handlebars on a Di2 build. The box is available in either a three or five port option, to accommodate either a one pair or two pair shifter arrangement.


  • 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
  • SM-EW90-B: 5-Port Cockpit Junction Box connects up to 2 pairs of Di2 shifters to the frame junction box via 5 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
  • Use Di2 system checker to update component firmware from
  • All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions

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This product was added to our catalog on July 26, 2014.