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Amazon.com: SHIMANO Ultegra ST-R8170/BR-R8170 Di2 Shift/Brake Lever and Hydraulic Disc Caliper - 2x12-Speed, Flat Mount, Black (Right / Rear) : Sports & Outdoors
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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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EuroBikeParts: Shimano Ultegra R8050 11s Di2 Electronic Group - Rim Brake, Shimano, SH-UL8050Di2Full
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