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SHIMANO DURA ACE ULTEGRA EW WU111 Di2 Wireless Data Transmitter Unit w/ EW SD50 E Tube WU111 200/300/350mm|Bicycle Derailleur| - AliExpress
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Amazon.com : SHIMANO EW-WU101A Wireless Unit, Bluetooth Compatible, Requires 1 separate EW-SD50 cable, IEWWU101A : Sports & Outdoors
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