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Amazon.com : Shimano Ultegra RD-R8050-GS Di2 Rear Derailleur - 11-Speed, Medium Cage, Black : Sports & Outdoors
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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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Amazon.com : Shimano Ultegra Di2 6870 11-Speed RD-6800 Outer Plate & Plate StopPER PIN SS-TYPE - Y5YC98070 : Sports & Outdoors
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