\n\t\t\tWith the Shimano SM-EW90-A E-Tube Di2 Junction-A - 3 Port the removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts. This Junction A is required to connect the shifters via E-Tube wires to the down tube junction wire 3-port design, one for down tube wire to bottom bracket junction, two for shifter connection.
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