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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 R8050 Di2 Groupset ULTEGRA R8050 Derailleurs ROAD Bicycle ST+FD+RD Front Derailleur REAR DERAILLEUR Shifter LEVER - AliExpress Sports & Entertainment
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