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Amazon.com : Shimano Derailleur GRX DI2 11 x 2 V Welding Electric Cycling Unisex Adult, (Multi-Colour), One Size : Sports & Outdoors
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Amazon.com: Shimano Dura-Ace RD-R9150-SS Di2 Rear Derailleur - 11-Speed, Short Cage, Black : Everything Else
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