Shimano GRX RX600 Hydraulic Left Lever with RX400 Flat Mount Brake Caliper

The Shimano GRX RX600 Dual Control lever provides smooth and responsive gear changes, ideal for rides on mixed terrain. The lever’s ergonomic design enhances comfort, whilst the textured, non-slip brake lever increases control on technical terrain – a lever perfectly suited to gravel riding.

With a compact Flat Mount design, the Shimano GRX BR-RX400 hydraulic disc brake calipers offer better control on mixed-terrain rides. The GRX brake caliper features optimal heat dissipation with convenient access to adjustments and bleeding.

Wheel changes are also optimised and convenient thanks to the Flat-Mount mounting system. The Shimano GRX groupset stands out with its Gravel-specific components: Gravel ergonomics, optimised gear-changing options, reliability, and a quiet, stable drivetrain. Shimano emphasises that this is not a reworked version of its road components, but rather a groupset specifically adapted to the demands of gravel riding.

Technical specifications

- Lever and mount ergonomics inspired by gravel riding
- Non-slip brake lever for better bike control
- Gear changes as smooth as with high-end systems
- Flat Mount mounting system
- Convenient access to adjustments with quick and easy bleeding
- Easy wheel replacement
- Shimano part number: IRX4001DLF6SC100A
- Model number: ST-RX600-L / BR-RX400-F
- Shimano groupset: GRX 11-speed
- Brake fluid type: mineral oil
- Braking type: hydraulic
- Drivetrain type: mechanical
- Number of gears: 2 chainrings
- Supplied without disc