Shimano GRX RD-RX820 rear derailleur - Shadow RD+ 2x12-speed

Shimano GRX RD-RX820 rear derailleur – 2x12-speed Shadow RD+ for gravel performance

Precision, stability and quietness – the derailleur for gravel adventures
The Shimano GRX RD-RX820 rear derailleur was specifically developed for gravel enthusiasts who demand maximum precision and reliability on any surface. With Shadow RD+ technology, it ensures quiet, stable shifting – even on rough trails or long gravel roads.
Designed for 2x12-speed drivetrains , the GRX RD-RX820 offers an impressive gear range and is compatible with 11-34 tooth (CS-R8101-12) or 11-36 tooth (CS-HG710-12) cassettes. This ensures you maintain an optimal cadence in every situation – whether climbing, flat, or descending.

Shadow RD+ technology for quiet propulsion
The integrated Shadow RD+ system effectively reduces chain slap and noise. The mechanical chain stabilizer can be switched on or off as needed to adapt the derailleur to changing conditions – perfect for a combination of gravel, road, and off-road riding. The result: less distraction, more focus on the ride.

Robust materials for durability and precision
The derailleur is made of high-quality aluminum , glass fiber reinforced plastic (GFRP) , steel , and stainless steel – a balanced mix of materials for lightness, durability, and precise function. The anodized and painted surfaces provide additional protection against dirt, moisture, and corrosion.

Compatibility with Shimano 12-speed systems
The Shimano GRX RD-RX820 is compatible with a wide range of Shimano components – including STI levers such as the ST-RX820 , ST-RX610 , and ST-R7120 , as well as cassettes and chains from the Shimano 12-speed series. This seamless integration guarantees precise, fast, and reliable shifting – perfectly in line with the Shimano philosophy.

Highlights of the Shimano GRX RD-RX820 rear derailleur

• Designed for gravel and adventure riding

• 2x12-speed shifting compatibility with a wide gear range

• Shadow RD+ technology for quiet, stable propulsion

• Chain stabilizer with on/off switch – ideal for varying terrain

• Robust materials : aluminum, steel, GFRP and stainless steel

• Lightweight, durable and precise – perfect for demanding tours

• Quiet shifting behavior thanks to optimized chain guidance

• Compatible with Shimano 12-speed groupsets