The Shimano GRX RD-RX820 Rear Derailleur delivers precise, stable shifting across 12-speed gravel drivetrains. With Shadow+ clutch technology, it maintains chain tension over rough terrain while reducing noise and slap.
Key Features
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12-speed rear derailleur for GRX drivetrains.
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Shadow+ clutch for chain stability.
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Smooth, accurate shifting under load.
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Optimized for mixed-terrain riding.
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Durable and lightweight construction.
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