# Shimano GRX RD-RX812 Rear Derailleur - 11-Speed Long Cage BLK With Clutch For 1x 42t Low Sprocket Max

The Shimano GRX 11-speed rear derailleur has an integrated chain stabilizer mechanism that provides a quieter experience shifting security and precision on mixed terrain. For rides on smooth surfaces the derailleur features an ON/OFF switch for the chain tensioner. The Shimano Shadow RD+ adjustable chain stabilizer provides silent and uninterrupted rear shifting on rough terrain.-   Adjustable Shimano RD+ chain stablizer prevents chain slapping and drops
-   Gravel-tuned clutch tension provides smooth and reliable mixed surface shifting
-   Compatible with Shimano road Dual Control Levers
-   Compatible with Shimano LinkGlide and HG 11-speed chains
    
    Largest Cog
    
    42
    
    Color
    
    Black
    
    Rear Der/Shifter Compatibility
    
    Shimano Road
    
    Rear Derailleur Mount Type
    
    10x1 Standard
    
    Drivetrain Speeds
    
    11
    
    Weight
    
    267
    
    Chain Wrap Capacity (teeth)
    
    31
    
    Cage Length
    
    Long
    
    Max Sprocket Size
    
    42T

## Details

- **Price:** 145.0 USD
- **Vendor:** Gio's Outdoors
- **Type:** Rear Derailleurs
- **Tags:** Gio's Outdoors, Shopify Collective

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 145.00 USD | In stock |

## Images

- Shimano GRX RD-RX812 Rear Derailleur - 11-Speed Long Cage BLK With Clutch For 1x 42t Low Sprocket Max

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> Source: [Smart supply deals](https://smartsupplydeals.com/products/shimano-grx-rd-rx812-rear-derailleur-11-speed-long-cage-blk-with-clutch-for-1x-42t-low-sprocket-max)
> Updated: 2026-07-22