Model Number: BB86-DUB-RD-BLK-ASMCT
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These pulleys are compatible with: 5700-series 105 7000-series 105 6800-series Ultegra R8000-series Ultegra (mechanical and Di2) R9000-series Dura Ace (mechanical and Di2) R9100-series Dura Ace (mechanical and Di2) ...and many more.