Shimano GRX RD-RX812 11sp Rear Derailleur 812-42D

Shimano GRX RD-RX812 11sp Rear Derailleur 812-42D

The Shimano GRX RD-RX812 rear derailleur is purpose-built for gravel and adventure riding, delivering precise, reliable shifting on mixed terrain. Designed to handle an 11-speed drivetrain with a maximum cassette size of 42T, it combines Shimano’s proven Shadow RD+ technology with gravel-specific refinement for smooth and stable performance no matter where the ride takes you.

Key Features

• Gravel-tuned performance: Engineered for rough roads and trails with optimized chain stability and reduced noise.

• Shadow RD+ clutch system: Keeps your chain secure and silent over rough surfaces by minimizing chain slap.

• Wide range compatibility: Compatible with 1x11 drivetrains and up to a 42T cassette, perfect for steep climbs and fast descents.

• Durable construction: Built to withstand the demands of gravel riding, adventure racing, and bikepacking.

• Smooth, precise shifting: Delivers consistent gear changes under load or in unpredictable terrain.

Specifications

• Model: RD-RX812

• Speeds: 11-speed

• Maximum low sprocket: 42T

• Minimum low sprocket: 40T

• Maximum front difference: Single front chainring only (1x setup)

• Compatible chain: HG-X11

• Mount type: Standard direct mount

• Clutch: Yes (Shadow RD+)

• Weight: Approx. 267 g

Why We Love It

The GRX RD-RX812 brings Shimano’s legendary reliability to the world of gravel. It’s the perfect upgrade or replacement for riders seeking crisp shifting and rugged dependability on long, unpredictable rides.