Shimano GRX RD-RX820 12-Speed Rear Derailleur

The Shimano GRX RD-RX820 12-speed rear derailleur is designed for gravel, road and cyclocross riders. It fits GRX 1x12 and 2x12 drivetrains.

• Works with both single and double drivetrains, 1x12 and 2x12
• Suitable for gravel, road and cyclocross in a single choice
• Accepts 11-34 and 11-36-tooth cassettes for climbs and flat terrain
• Lightweight: weighs approximately 270 g
• Choose the right cassette: the largest chainring must not exceed 36 teeth

Technical specifications

• Model: GRX RD-RX820
• Speed: 12
• Compatible cassettes: 11-34 and 11-36 teeth
• Maximum tooth capacity: 42 teeth
• Maximum largest chainring: 36 teeth
• Maximum crankset difference: 17 teeth
• Weight: Approximately 270 g
• Compatibility: GRX 12-speed drivetrains, 2x12 and 1x12
• Intended use: Gravel, road and cyclocross
• Item code: IRDRX820

Founded in 1921 in Sakai, Japan, by Shozaburo Shimano, Shimano is still based in the same city today. For cyclists, it makes drivetrains, brakes, wheels, pedals and cycling shoes. Its history in bicycle components began with the production of freewheels in 1922.