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Shimano GRX RD RX817 Di2 Rear Derailleur 1 x 11 Speed model ttirdisc Giant TCR Advanced SL Disc Giant TCR Advanced SL Disc Road Bike 2019 1 X Large Frame An adjustable Shimano Shadow RD+ clutch prevents chain slapping and drops The Shimano GRX 11 speed Di2 rear derailleur integrates electronic shifting with silent and uninterrupted rear operation on rough terrain
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