Shimano Grx RD-RX820 Rear Derailleur

ENGINEERED FOR GRAVEL CONTROL AND CONSISTENT SHIFTING IN THE TOUGHEST CONDITIONS.

The Shimano GRX RD-RX820 Rear Derailleur brings precise, quiet and stable shifting performance to 2x12 gravel and adventure setups. Designed around the rugged SHADOW+ chain-stabilizing system, this derailleur keeps your chain firmly in place across rough surfaces, steep climbs and fast descents. The low-profile design reduces exposure to trail strikes, while its smooth cable routing and refined 12-speed architecture deliver crisp, predictable shifting whether loaded, racing or exploring.

The RD-RX820 offers refined chain security and wider cassette compatibility, supporting up to a 36-tooth maximum low gear for optimized range on long climbs. With gravel-specific ergonomics and durable construction, it unlocks a reliable drivetrain ready for demanding terrain and long-distance riding.


KEY FEATURES

The GRX RD-RX820 introduces Shimano's SHADOW+ chain stabilization for quieter, more controlled off-road shifting. Its 12-speed design ensures smooth gear progression suited to all-terrain riding. A low-profile structure minimizes impact risks, and its advanced clutch mechanism reduces chain slap for a more stable ride. The derailleur is tailored for 2x12 gravel setups, built to withstand mud, dust and vibration while maintaining consistent performance.


WHY CHOOSE

Choose the RD-RX820 for dependable gravel-tuned shifting, enhanced chain retention and a drivetrain built specifically for adventure. It provides exceptional control on rough roads, efficient gearing on mixed surfaces and the durability required for long-term performance.


PERFECT FOR

Riders looking for a stable, quiet and highly reliable 12-speed derailleur for gravel racing, bikepacking, all-terrain adventures and performance touring.


SPECIFICATIONS

Series: Shimano GRX RX820
Model: RD-RX820
Speed: 12-speed
Compatible Drivetrain: 2x12 GRX
Maximum Low Sprocket: 36T
Minimum Low Sprocket: 30T
Maximum High Sprocket: 11T
Minimum High Sprocket: 11T
Clutch System: SHADOW+ chain stabilizer
Mount Type: Standard rear derailleur mount
Low-Profile Design: Yes