Shimano GRX RD-RX820 12sp Rear Derailleur

With an integrated chain stabilizer mechanism, the GRX rear 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-RX820 rear derailleur is compatible with MTB cassettes with a 42T low sprocket max.

• GRX 12 speed rear derailleur for double cranks
• Adjustable chain stabilizer prevents chain slapping and drops
• Gravel-tuned clutch tension can be toggled ON/OFF to match the terrain
• Maximum front difference: 17T
• Total capacity: 42T
• Low sprocket: Max. 34T/Min. 30T
• Top sprocket: 11T

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