Shimano GRX RD-RX820 12S rear derailleur

Increased chain stability and quieter and more stable gear changes for Gravel

The RD-RX820 is compatible with 12v 11-34D and 11-36D cassettes, and offers a wide range of ratios to maintain a comfortable cadence regardless of the type of terrain. The SHIMANO GRX 12v rear derailleur features an integrated chain stabiliser that ensures quieter shifting and safer chain handling in demanding situations. The chain tensioner is also equipped with an ON/OFF switch for pedalling on even surfaces.

Features

• Quiet and reliable shifting on rough terrain
• Adjustable stabiliser prevents the chain from slamming and prevents the chain from falling off
• SHIMANO SHADOW RD+
• Smooth and reliable shifting on mixed terrain
• Stabiliser ON/OFF switch allows adaptation to the terrain
• Max. difference between chainring teeth: 17D
• Smallest sprocket: Max. 11D/Min. 11D
• Largest sprocket: Max. 36D/Min. 34D
• Total capacity: 42D
• Shimano SIS OT-RS900 24 cm sheath included

Technical specifications

• Series: GRX 12-speed
• Sprockets: 12
• Compatible chain: HG 12-speed
• Top-normal spring type: SHIMANO SHADOW RD+
• Mounting: Direct mount (conventional)
• Direct mount
• Cable adjuster
• Max. front differential: 17D
• Total capacity: 42D
• Sprocket min|Max: 36D
• Sprocket min|Min: 34D
• Sprocket Max|Max: 11D
• Sprocket Max|Min: 11D
• Fluoro-Coated Bushings 4
• Pulley|Teeth: 11/13D

Technology