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Amazon.com : Shimano Ultegra Di2 RD-R8050-SS Rear Derailleur - 11 Speed, Short Cage, Black : Sports & Outdoors
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Shimano Ultegra R8050 R8010 Di2 2x11-speed Groupset Road Bike Groupset 170 50-34 53-39 Bicycle Group Set 2*11 Speed - Bicycle Crank & Chainwheel - AliExpress
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EuroBikeParts: Shimano Ultegra R8050 11s Di2 Electronic Group - Rim Brake, Shimano, SH-UL8050Di2Full
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