Rear Derailleur Shimano GRX RD-RX820 12-speed

Rear Derailleur Shimano GRX RD-RX820 12-speed

The Shimano GRX RD-RX820 is a 12-speed gravel rear derailleur delivering enhanced chain security and quieter, more stable shifting for demanding mixed-surface riding.

Compatible with 11–34T and 11–36T 12-speed cassettes, the RD-RX820 provides a wide gear range to maintain optimal cadence across varied terrain. The integrated chain stabilizer (SHIMANO SHADOW RD+) reduces chain slap and prevents chain drops on rough sections.

An ON/OFF clutch switch allows you to disengage the stabilizer for smoother riding on paved roads or engage it for maximum control on gravel and trails. The result is smooth and reliable shifting in every condition.

• Use: Gravel
• Model: RD-RX820
• Speeds: 12
• Technology: SHIMANO SHADOW RD+
• Compatible cassette: 11–34T / 11–36T
• Compatible chain: HG 12-speed
• Large sprocket: 34–36T
• Small sprocket: 11T
• Weight: approx. 270 g