With an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain.

For rides on smooth surfaces, the derailleur features an ON/OFF switch for the chain tensioner. The RD-RX815 Di2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting and is compatible with road cassettes with a 34T low sprocket max.

• SHIMANO SHADOW RD+ for DI2 (11-speed)
• Adjustable chain stabilizer prevents chain slapping and drops
• Switch stabilizer ON/OFF to match the terrain
• Gravel-tuned clutch tension
• Silent and uninterrupted rear shifting on rough terrain
• Total capacity: 42T
• Smooth and reliable mixed surface shifting
• Compatible with current road DUAL CONTROL LEVER
• Maximum front difference: 17T
• Top sprocket: Max. 11T/Min. 11T
• Low sprocket: Max. 34T/Min. 30T
• Total Capacity: 38T
• E-TUBE port: 1
• Pulley: 13T
• Rear Speeds: 11