Rear Disc Brake Caliper Shimano GRX BR-RX820 Flat Mount

Rear Disc Brake Caliper Shimano GRX BR-RX820 Flat Mount

The Shimano GRX BR-RX820 is a hydraulic 2-piston rear disc brake caliper with Flat Mount design, developed specifically for gravel and cyclocross bikes. It delivers powerful, precisely controlled braking performance while maintaining durability in demanding conditions.

The RX820 series reflects Shimano’s gravel philosophy – simplicity, reliability and adventure-ready performance. ICE TECHNOLOGIES heat management combined with L05A-RF resin brake pads with fins ensures excellent heat dissipation and consistent braking on long descents and rough terrain.

The Flat Mount design, ONE WAY BLEEDING system and J-kit hose connection make installation and servicing clean and straightforward. The aluminium caliper weighs approximately 134 g and allows quick wheel changes with convenient tool access.

• Application: Gravel / Cyclocross
• Group: GRX
• Model: BR-RX820-R
• Brake type: Hydraulic disc brake
• Mount: Rear
• Brake mount: Flat Mount
• Brake pads: L05A-RF Resin with fins
• Hose connection: Straight (J-kit)
• One-way bleeding: Yes
• Brake fluid: Shimano mineral oil
• Recommended lever: ST-RX820 / BL-RX820 / ST-RX820-LA
• Recommended hose: SM-BH90-JK-SS
• Recommended rotor: SM-RT800
• Material: Aluminum
• Weight: approx. 134 g