Shimano GRX RD-RX820
The Shimano GRX RD-RX820 is a 12-speed gravel rear derailleur with integrated chain stabilizer, adjustable clutch, and 42T capacity for mixed terrain riding. It combines secure chain management with a quiet, precise feel for unpaved surfaces.
- 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
Pre-order — expected in stock September 25, then ships direct to you.
Pairs well with
Shimano GRX RD-RX820
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