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SHIMANO - Junction A - E-TUBE - Under Stem Mount - 3-Port SHIMANO's SM-EW90-A 3-port Junction A mounts neatly to the bike stem and connects with E-TUBE wires from DI2 shifters and the downtube junction wire. The SM-EW90 junction box features an integrated battery level indicator, charging port, and gear index setup switch.
Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur, rear derailleur, cockpit junction box and battery mount. All Di2 components require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions. Shimano Di2 Junction Box Junction Box UPC: 689228827462
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