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
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.
Weights are based off pre-production products at time of publication. Weights may vary in final production.
