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Amazon.com : SHIMANO Wireless Unit for Di2 System, EW-WU111, E-Tube Port X2, for 52 Countries : Sports & Outdoors
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SHIMANO DURA ACE ULTEGRA EW-WU111 Di2 Wireless Data Transmitter Unit EW-SD50 E-Tube WU111 SD50 150mm - AliExpress
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Shimano's new Ultegra Di2 electronic-only groupset delivers Dura-Ace performance for less cash - BikeRadar
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