The RD-RX820 model is compatible with 12-speed 11-34T and 11-36T cassettes, offering a wide gear range that allows maintaining a comfortable cadence regardless of terrain type. The SHIMANO GRX 12-speed derailleur features an integrated chain stabilizer that ensures quieter shifting and safer chain management in demanding situations. The chain tensioner also includes an ON/OFF switch for pedaling on smooth surfaces.

Features

• Quiet and reliable shifting on rough terrain
• The adjustable stabilizer prevents chain slap and chain drop
• SHIMANO SHADOW RD+
• Smooth and reliable shifting on mixed terrain
• The stabilizer ON/OFF switch allows adaptation to terrain
• Max tooth difference between chainrings: 17T
• Smallest cog: Max. 11T/Min. 11T
• Largest cog: Max. 36T/Min. 34T
• Total capacity: 42T
• Shimano SIS OT-RS900 24 cm housing included

Technical specifications

• Series: GRX 12-speed
• Cogs: 12
• Compatible chain: 12-speed HG
• Top-normal spring type: SHIMANO SHADOW RD+
• Mounting: Direct mount (conventional)
• Direct mount
• Cable adjuster
• Max front difference: 17T
• Total capacity: 42T

Technologies