Rear Der Shimano RX825 GRX Di2 12-Speed Black

United in gravel

Shimano's GRX Di2 rear derailleur offers the perfect mix of durability and weight savings for all your gravel needs.

Shimano's GRX Di2 12-speed rear derailleur features a built-in wireless connectivity unit for fast and reliable shifting in mixed-terrain, while the integrated charging port makes recharging a breeze.

Key Features

• Compact design with integrated wireless unit, charging port, and switch
• Fast and reliable shifting on rough terrain
• Adjustable chain stabilizer prevents chain slap
• Gravel-tuned clutch tension
• Switch stabilizer ON/OFF to match terrain, use ON for gravel, OFF for smooth roads
• LED status indicator
• Top sprocket: Max. 11T/Min. 11T, Low sprocket: Max. 36T/Min. 34T
• Total capacity: 40T

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