Shift/Brake Set Shimano GRX ST-RX600/BR-RX400 Left, 2-speed

Shift/Brake Set Shimano GRX ST-RX600/BR-RX400 Left, 2-speed

The Shimano GRX ST-RX600 + BR-RX400 is a left-hand 2-speed Dual Control shift and hydraulic disc brake set designed for gravel, road and cyclocross riding. GRX-specific ergonomics are tailored for mixed terrain, offering secure grip, stable handling and precise shifting even on rough surfaces.

The BR-RX400 Flat-Mount caliper delivers powerful and consistent braking performance on steep descents and demanding terrain. Efficient heat dissipation helps maintain stable braking force, while the one-way bleeding system ensures easy and clean maintenance. A non-slip brake lever and tool-adjustable reach allow riders to fine-tune their setup for maximum control.

• Application: Gravel, Road, Cyclocross
• Series: GRX
• Model: ST-RX600 / BR-RX400
• Type: Dual-Control (STI)
• Mount: Left
• Front speeds: 2-speed
• Reach adjustment: Yes, with tool
• Handlebar diameter: 23.8–24.2 mm
• Brake type: Hydraulic disc brake
• Brake caliper: BR-RX400-L
• Mount type: Flat-Mount
• Brake pads: L03A Resin with Fin
• Brake hose: SM-BH90-JK-SSR front 1000 mm (cuttable)
• One-way bleeding: Yes
• Brake fluid: Shimano mineral oil
• Recommended rotor: SM-RT64, SM-RT70, SM-RT800