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Wireless transmission unit with connections Shimano ew-wu101 pour dura ace/ultegra Di2 - Transmission - MTB - Bikes
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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 EW-WU111 Di2 Wireless Module Installation ANT+ Bluetooth LE - Password Not Working Problem - YouTube
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