Rear Der Shimano RX820 GRX 12-Speed Black

Unstoppable and undroppable

A GRX rear derailleur for enhanced chain security and quieter shifting for gravel riding.

The RD-RX820 is compatible with 11-34T and 11-36T 12-speed cassettes, providing a wide gear range so you can spin a comfortable cadence no matter the terrain type.

The Shimano GRX 12-speed rear derailleur also features an integrated chain stabilizer that delivers quieter shifting and more secure chain management during rough rides. And the chain tensioner has an On/Off switch for outings on smooth surfaces.

Key Features

• Silent and secure rear shifting on rough terrain
• Adjustable chain stabilizer prevents chain slap and drops
• Shimano Shadow RD+ technology
• On/Off stabilizer switch matches terrain
• Maximum front chainring difference: 17T
• Top sprocket: Max. 11T/Min. 11T
• Low sprocket: Max. 36T/Min. 34T
• Total capacity: 42T

Features

Shimano GRX

Shimano GRX was designed from the ground up for gravel adventure. With its gravel-specific ergonomics, optimized gearing options, rugged reliability, and quiet, stable drivetrain, GRX sets itself apart from the rest of the component world.

Shadow RD+

Shimano's Shadow RD+ technology uses an adjustable rear derailleur clutch to reduce chain slap over rough terrain. This simple chain drop solution is lighter and more efficient than roller bearing chain management devices.

Specifications