Shimano GRX RX610/RX400 Left Brake Lever and Front Brake Set

The Shimano GRX RX610/RX400 Left Brake Lever and Front Brake Set pairs a hydraulic disc brake caliper with a lever built specifically around the demands of gravel riding. The RX610 lever is shaped for natural hand placement on drop bars — including flared bars — and includes reach adjustment so you can dial in the pull distance to suit your hand size or riding preference. An anti-slip texture on the lever body keeps things predictable when your hands are wet or muddy.

The RX400 flat mount caliper uses a two-piston hydraulic system to deliver consistent, controlled stopping power across varied terrain. Hydraulic actuation means braking force scales with how hard you squeeze, not how worn your cables are, and the caliper is designed with heat dissipation in mind for the long descents and mixed-surface conditions gravel routes tend to throw at you. It's a practical, well-matched combination for building up or refreshing a gravel bike's front end.

Shimano GRX RX610/RX400 Left Brake Specs at a Glance

• Lever: Shimano GRX RX610, left-hand
• Caliper: Shimano GRX RX400, front, flat mount
• Actuation: Hydraulic disc
• Piston count: Two-piston caliper
• Compatibility: Designed for flared and standard drop bars
• Color: Black