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Amazon.com : Shimano Rear DERAILLEUR, RD-R8000, ULTEGRA, GS 11-Speed, Shadow Design, Direct Attachment, W/OT-RS900(Black) : Sports & Outdoors
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Tinkering 101: Shimano 105 Derailleur Hack by Thomas Aceves - Gravel Cyclist: The Gravel Cycling Experience
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Shimano Ultegra RD-RX800-GS Rear Derailleur - 11 Speed, Medium Cage, Black, With Clutch : Everything Else - Amazon.com
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