Shimano GRX RD-RX812 11sp Rear Derailleur 812-42D
ROULEUR – LOW COMPRESSION FIT
A looser fit that sits slightly away from the skin for complete freedom of movement and improved airflow. Optimised for comfortable all-round riding.
| SIZE | CHEST | WAIST | HIPS |
|---|---|---|---|
| XS | 88 | 72 | 88 |
| S | 94 | 78 | 94 |
| M | 100 | 84 | 100 |
| L | 106 | 90 | 106 |
| XL | 112 | 96 | 112 |
| XXL | 118 | 102 | 118 |
| XXXL | 124 | 108 | 124 |
LITE – HIGH COMPRESSION FIT
A slim, close-to-body fit engineered for performance. Designed for an aggressive riding position, it delivers aerodynamic efficiency and a second-skin feel for maximum speed and focus on the bike.
CHEST
Measure around the fullest part of your chest.
WAIST
Measure around the smallest part of your waist.
HIP
Measure around the fullest part of your hips.
| SIZE | CHEST | WAIST | HIPS |
|---|---|---|---|
| XS |
83-88
|
<75 | - |
| S | 88-94 | 75-81 | - |
| M |
94-100
|
81-87 | - |
| L | 100-106 | 87-92 | - |
| XL | 100-106 | 92-98 | - |
| XXL | 100-106 | 98-104 | - |
- In stock, ready to ship
- Backordered, shipping soon
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
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Gravel-tuned performance: Engineered for rough roads and trails with optimized chain stability and reduced noise.
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Shadow RD+ clutch system: Keeps your chain secure and silent over rough surfaces by minimizing chain slap.
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Wide range compatibility: Compatible with 1x11 drivetrains and up to a 42T cassette, perfect for steep climbs and fast descents.
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Durable construction: Built to withstand the demands of gravel riding, adventure racing, and bikepacking.
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Smooth, precise shifting: Delivers consistent gear changes under load or in unpredictable terrain.
Specifications
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Model: RD-RX812
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Speeds: 11-speed
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Maximum low sprocket: 42T
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Minimum low sprocket: 40T
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Maximum front difference: Single front chainring only (1x setup)
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Compatible chain: HG-X11
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Mount type: Standard direct mount
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Clutch: Yes (Shadow RD+)
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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.
Estimated delivery times are as follows:
Spain: 2 – 3 working days
Europe: 5- 7 working days
UK: 7 – 14 working days
Rest of the World: 7 – 14 working days
- FAST WORLDWIDE DELIVERY
- 30 DAYS TO CHANGE OR REFUND
