# Shimano GRX RD-RX825 Di2 Rear Derailleur - 12-Speed Long Cage With Clutch For 2x BLK

Shimano's GRX RX825 Di2 12-speed rear derailleur features a built-in wireless connectivity unit and charging port ensuring fast and reliable shifting for mixed-terrain riding and easy recharging. Integrated Shadow RD+ technology prevents chain slap and ensures precise shifting even on rough terrain. Thanks to built-in ON/OFF switch wheel removal is easy too. The RD-RX825 is compatible with 11-34t and 11-36t 12-speed cassettes and supports Full or Semi-Synchronized shift modes enhancing rider customization.-   Integrated wireless unit charging port and switch allows a compact design
-   Offers fast and reliable shifting on rough terrain
-   Adjustable chain stabilizer prevents chain slap
-   Shimano Shadow RD+ offers a quiter drivetrain by utilizes a stablizer to reduce chain slap and provides a simple solution for chain drops
-   Gravel-tuned clutch tension features a switch stabilizer ON/OFF to match terrain - ON for gravel OFF for smooth roads
-   LED status indicator to easier identify battery life pairing adjust mode etc.
-   Top sprocket: Max. 11t/Min. 11t
-   Low sprocket: Max. 36t/Min. 34t
-   Total Capacity: 40t
    
    Largest Cog
    
    36
    
    Rear Der/Shifter Compatibility
    
    Shimano Road Di2
    
    Rear Derailleur Mount Type
    
    Shimano Rear Direct Mount
    
    Drivetrain Speeds
    
    12
    
    Chain Wrap Capacity (teeth)
    
    40
    
    Cage Length
    
    Long
    
    Color
    
    Black

## Details

- **Price:** 445.0 USD
- **Vendor:** Gio's Outdoors
- **Type:** Rear Derailleurs
- **Tags:** Gio's Outdoors, Shopify Collective

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 445.00 USD | In stock |

## Images

- Shimano GRX RD-RX825 Di2 Rear Derailleur - 12-Speed Long Cage With Clutch For 2x BLK

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> Source: [Smart supply deals](https://smartsupplydeals.com/products/shimano-grx-rd-rx825-di2-rear-derailleur-12-speed-long-cage-with-clutch-for-2x-blk)
> Updated: 2026-07-22