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