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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 Di2 RD-RX805-GS Rear Derailleur- 11 Speed, Medium Cage, w/Clutch 689228340558 | eBay
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Shimano Ultegra Di2 RD-R8050 Rear Derailleur (Black) (11 Speed) (Medium Cage) (GS) - Performance Bicycle
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