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Shimano Ultegra R8050 2x11v Groupset With 2x11 Speed Di2 Shifters Front Rear Derailleur And E-tube Project Original - Bicycle Derailleur - AliExpress
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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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