Shimano GRX BL-RX825/BR-RX820 Left Hydraulic Brake Set for Di2 1x12
Lightweight and grippy 1x12 gravel brake set with flat-mount caliper and easy service features — ideal for wireless Di2 builds.
- Hydraulic 1x12 brake lever
- Flat-mount w/ ICE Tech
- One-way bleed for easy setup
- Resin pads with cooling fins
Overview
Shimano GRX BL-RX825/BR-RX820 Left Hydraulic Brake Set for Di2 1x12
The Shimano GRX BL-RX825-L brake lever, paired with the BR-RX820 flat-mount caliper, is purpose-built for gravel riders seeking a simple and lightweight 1x12-speed setup without integrated shifting. It offers the same ergonomic benefits as the RX825 DUAL CONTROL levers, including raised, ribbed hoods and anti-slip texture, but omits shift buttons for streamlined control.
Designed for adventure and control, this system features ICE TECHNOLOGIES for excellent heat management, clean routing with J-kit hose, and easy maintenance with ONE WAY BLEEDING. The caliper is optimized for quick wheel changes and stable performance across rugged terrain.
Ideal for pairing with the fully wireless GRX RX827 Di2 rear derailleur, this brake system delivers reliable stopping power and rider-focused ergonomics for modern gravel riding.
- 1x12-speed hydraulic lever with flared drop ergonomics
- Flat-mount caliper with ICE TECHNOLOGIES
- Simple servicing via ONE WAY BLEEDING
- Resin pads with fins (L05A-RF)
Technical specifications:
- Use: Gravel, Cyclocross
- Group: Shimano GRX RX827
- Model: BL-RX825-L / BR-RX820
- Mount: Flat-Mount, left handlebar
- Brake type: Hydraulic Disc Brake
- Brake pads: L05A-RF resin with fins
- Brake hose: SM-BH90-JK-SS, 1000 mm (shortenable)
- Brake fluid: Mineral oil
- Recommended rotors: SM-RT64, SM-RT70, SM-RT800
- Material: Aluminum (lever and caliper)
