The Shimano GRX RD-RX820 is a 2 x 12-speed rear derailleur engineered for gravel and mixed-terrain riding. Its integrated chain stabilizer reduces bounce and chatter on rough surfaces, with an ON/OFF switch to deactivate it on smooth roads.
The Shadow Plus design delivers precise, quiet shifting, while the cold-forged aluminium construction keeps weight minimal without compromising durability. Compatible with 12-speed Hyperglide+ chains and cassettes up to 36T, this derailleur pairs perfectly with double chainsets for versatile gear ratios. An essential upgrade for gravel cyclists demanding reliable performance across all terrains.
Features
- Shimano GRX, with its gravel specific ergonomics, optimized gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world
- Low profile Shadow Plus design 12-speed rear derailleur for fast and precise shifting performance
- Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting
- High tolerance cold forged aluminium link plates and body construction is extremely light and durable
- Compatible with 12-speed Hyperglide+ chains
- Wide gear ratio compatible up to 11-36T
- For use with double chainset
Specification
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Use: Gravel, Cyclocross
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Group: GRX
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Model: RD-RX820
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Mount: Direct attachment (Conventional)
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Technology: Shadow RD+
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Gear front: 2-speed
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Gear rear: 12-speed
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Compatible Chain: 12-speed HG
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Max. teeth large sprocket: 36T
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Min. teeth large sprocket: 34T
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Max. teeth small sprocket: 11T
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Min. teeth small sprocket: 11T
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Max. Front Difference: 17T
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Total Capacity: 42T
Material
Colour
Weight
Contents
- 1 x Shimano GRX 2x12-speed RD-RX820 Rear Derailleur
