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Dura-Ace Di2 (Dual Integrated Intelligence) moves to the next generation. Tested in competition and taken to victory by pro riders in all conditions, including the 2012 Tour de France Team Sky.
The under-stem Junction Box A is key to the versatility of a 9070 setup with multiple shifters. The EW90-F 5-port box is designed for an aero-handlebar setup and allows you to use Aero Dual Control shifters alongside Remote shifters on the aero extensions and/or Sprinter shifters.
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Shimano Di2 SM-EW90-F Junction Box B - 5 Port