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Shimano
Shimano GRX RD-RX812-GS Rear Derailleur | 11-Speed 1x Gravel RD | OE
Shimano GRX RD-RX812-GS Rear Derailleur | 11-Speed 1x Gravel RD | OE
Regular price
$86.99 USD
Regular price
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Sale price
$86.99 USD
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SHIMANO GRX RD-RX812 11-SPEED REAR DERAILLEUR
SHADOW RD+ CHAIN STABILIZER FOR 1X11 GRAVEL DRIVETRAINS (MAX 42T)
Conquer challenging gravel tracks, dirt roads, and uneven terrain with the Shimano GRX RD-RX812-GS 11-speed rear derailleur. Purpose-built for 1x11-speed gravel and adventure setups, the RD-RX812 features Shimano's integrated Shadow RD+ adjustable chain stabilizer (clutch mechanism) to eliminate chain slap, dropped chains, and noise on rough ground. Capable of clearing wide-range cassettes up to 42T, it provides silent, precise, and immediate shifting performance on demanding climbs and mixed-surface gravel adventures. Delivered in 100% authentic OEM workshop bulk packaging.
FEATURES
- Optimized for 1x11 Gravel Systems: Specially engineered for single-chainring setups with wide-ratio 11-40T or 11-42T cassettes.
- Integrated Shadow RD+ Chain Stabilizer: Adjustable friction clutch toggle prevents chain slap and derailment on bumpy trails for a whisper-quiet drivetrain.
- Wide-Range Climbing Capacity: Effortlessly clears large 40T/42T rear cogs to tackle steep off-road gradients with ease.
- Gravel-Tuned Cable Tension: Maintains smooth, light, and immediate shifting response in wet, muddy, or dusty conditions.
- Road STI Shifter Compatibility: Works seamlessly with Shimano 11-speed Dual Control road/gravel levers (e.g., GRX ST-RX810, Ultegra ST-R8020, 105 ST-R7020).
- OEM Workshop Bulk Packaged: 100% genuine, factory-fresh Shimano component delivered in cost-effective workshop bulk packaging.
- Brand: SHIMANO
- Series: GRX 11-Speed
- Model: RD-RX812-GS
- Cage Length: Medium Cage (GS)
- Speed: 11-Speed
- Drivetrain Type: 1x11 Single Chainring Setup Only
- Chain Stabilization: SHADOW RD+ (ON/OFF Clutch Switch)
- Largest Cog Capacity: Max 42T / Min 40T
- Smallest Cog Capacity: Max 11T / Min 11T
- Total Capacity: 31T
- Weight: Approx. 267 g
- Packaging: Genuine Shimano Workshop / Bulk Packaging
Q: Can I use RD-RX812 with a 2x double front chainring setup?
A: No. The RD-RX812 is designed specifically for 1x11 single-chainring setups (max 42T cassette). If you are running a 2x double drivetrain, you should use the RD-RX810 rear derailleur instead (max 34T cassette).
Q: Is this derailleur compatible with standard Shimano 11-speed road drop-bar shifters?
A: Yes! RD-RX812 uses standard Shimano 11-speed road cable leverage, making it 100% compatible with Ultegra R8000, 105 R7000, Tiagra 4700 (10-speed exception), and GRX 11-speed STI shifters.
Q: What is the function of the ON/OFF switch on the derailleur?
A: The switch engages or disengages the Shadow RD+ friction clutch. Turn it ON while riding to stabilize the chain and prevent slap; switch it OFF for easy rear wheel removal during maintenance.
- Processing Time: Ships within 24–48 hours from our California warehouse.
- Delivery Time: Standard shipping usually arrives within 3–7 business days across the US mainland.
- Tracking: Tracking information will be emailed immediately once your package is dispatched.
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