SHIMANO GRX ST-RX600 + BR-RX400 Hydraulic Disc Brake

The SHIMANO GRX ST-RX600-R + BR-RX400 is a complete rear shift and hydraulic disc brake set developed specifically for gravel, all-road and cyclocross bikes. It combines the ST-RX600 Dual Control lever with the BR-RX400 hydraulic Flat Mount brake caliper, providing precise mechanical shifting and powerful, controlled braking.

The ST-RX600 Dual Control lever features GRX-specific ergonomics designed to provide excellent control on rough and mixed terrain. Its textured, anti-slip brake lever surface helps maintain a secure grip, while reach adjustment allows the lever position to be adapted to the rider.

The BR-RX400 hydraulic brake caliper uses a 2-piston design and Flat Mount interface. Combined with SHIMANO mineral oil and the SM-BH90 brake hose, it provides consistent and predictable braking performance in changing riding conditions.

The set is supplied with a SM-BH90-JK-SSR brake hose, brake pads and shifting components, providing a complete solution for GRX drivetrain.

Key Features

• Complete GRX rear brake and shift set – lever, caliper and brake hose
• ST-RX600 Dual Control lever –  shift and brake control
• BR-RX400 hydraulic brake caliper – reliable braking performance
• Flat Mount design – designed for modern gravel and road frames
• 2-piston caliper – controlled and consistent braking
• GRX-specific ergonomics – optimised for gravel and mixed terrain
• Anti-slip lever surface – improved control on rough surfaces
• Reach adjustment – adjustable lever position
• SHIMANO mineral oil – proven hydraulic brake system