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Brakes
Shimano GRX BR-RX820 Hydraulic Disc Brake Caliper
Front · Flat mount
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 hydraulic disc-brake specificationManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano brake-caliper and rotor compatibility C-461ManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano hydraulic brake-system compatibility C-499ManufacturerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
- Shimano BR-RX820 front exact package identityRetailerSource checked Jul 28, 2026Evidence reviewed Jul 28, 2026
Technical data
Specifications
- Supported brake control interfaces
- Hydraulic Mineral Oil
- Compatible brake hoses
- Sm-Bh90-J-Ssr, Sm-Bh90-Jk-Ssr
- Compatible rotor models
- Rt-Cl300, Rt-Cl700, Rt-Cl800, Rt-Cl900, Rt-Em300, Rt-Em600, Rt-Em800, Rt-Em810, Rt-Em900, Rt-Em910, Rt-Mt800, Rt-Mt900, Rt-Mt905, Sm-Rt10, Sm-Rt26, Sm-Rt30, Sm-Rt54, Sm-Rt56, Sm-Rt64, Sm-Rt66, Sm-Rt70, Sm-Rt76, Sm-Rt800, Sm-Rt81, Sm-Rt86, Sm-Rt900, Sm-Rt99, Sm-Rt99-A
- Brake pad materials
- Metal, Resin
- Brake pistons
- 2
- Supported positions
- Front
- Brake mount
- Flat Mount
- Supported rotor diameters
- 140 mm, 160 mm, 180 mm