Front derailleurs
Shimano GRX FD-RX820 Front Derailleur
Mechanical 2x12-speed braze-on
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
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Evidence and freshness
Technical-source dates and retailer offer checks are separate. A retailer check does not validate compatibility.
Report a correction- Technical review
- Jul 28, 2026
- Compatibility review
- Reviewed Jul 28, 2026
Approved technical sources
- Shimano GRX front derailleur specificationManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano front drivetrain compatibility C-455ManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
Technical data
Specifications
- Supported speeds
- 12-speed
- Compatible chain families
- Shimano HG 12-speed
- Front drivetrain groups
- Shimano C455 Grx 2x12
- Front speeds
- 2x
- Shift actuation
- Mechanical
- Front derailleur mount
- Braze On
- Minimum outer chainring
- 46T
- Maximum outer chainring
- 48T
- Total capacity
- 17T
- Minimum chainstay angle
- 63°
- Maximum chainstay angle
- 66°
- Chainline
- 47 mm