The Shimano GRX RD-RX812 Rear Derailleur is an 11-speed gravel-specific rear derailleur designed for mixed terrain riding, featuring the SHIMANO SHADOW RD+ clutch system for enhanced chain stability. With an integrated chain stabilizer, it reduces chain slap and noise while providing precise and reliable shifting on rough roads, gravel, and MTB cassettes up to a 42T low sprocket.
The derailleur includes a gravel-tuned clutch with an ON/OFF switch, allowing riders to adjust chain tension based on terrain, ensuring smooth pedaling on flat surfaces and secure engagement on rough trails. Compatible with current Shimano road DUAL CONTROL LEVERS, it balances lightweight performance, durability, and shifting precision for endurance and adventure cycling.
Key Features:
Model: Shimano GRX RD-RX812
Series: GRX 11-Speed
Speed Compatibility: 11-Speed
Max Low Sprocket: 42T
Top Sprocket: 11T
Total Capacity: 31T
Chain Compatibility: LINKGLIDE, HG 11-Speed
Technology: SHIMANO SHADOW RD+ clutch, adjustable chain stabilizer
Mount Type: Direct attachment / Direct Mount
Pulley System: 11T G and T bearing pulleys, sunken pulley bolts, fluoric-coated link bushings
Features: Hollow B-axle, smooth mixed-surface shifting, ON/OFF clutch switch
Weight: Approx. 267 g
Optimized for gravel and mixed-terrain riding with quiet, secure, and precise rear shifting

