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EuroBikeParts: Shimano Ultegra R8050 11s Di2 Electronic Group - Rim Brake, Shimano, SH-UL8050Di2Full
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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 Di2 Ultegra R8050 50/34t 53/59t 165/170/172.5/175mm 2*11 Speed Electronic Road Bike Bicycle Groupset Update R8000 - Bicycle Derailleur - AliExpress
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