Set up your gravel bike's front hydraulic braking system with this pre-assembled Shimano GRX J-Kit. It pairs the right-hand ST-RX810 11-speed dual control lever with the BR-RX810 flat-mount front caliper — pre-bled with mineral oil and supplied with a 1700mm hose — so installation is clean and fast.

Highlights

• SERVOWAVE technology: takes up pad clearance quickly then ramps up power progressively, delivering confident, modulated braking with minimal lever effort.
• ICE TECHNOLOGIES resin pad with cooling fin: three-layer rotor design and finned pad dissipate heat to reduce fade on long gravel descents.
• Gravel-tuned lever ergonomics: curved lever blade with anti-slip coating and a hood shape designed for both on-hood and in-drop hand positions on mixed terrain.
• Pre-bled J-Kit convenience: lever, caliper, and 1700mm hose arrive assembled and pre-bled — ready to install with no bleeding required out of the box.
• Reach adjust: tool-based reach adjustment lets you position the lever to suit your hand size and riding style.
• One Way Bleeding: Shimano's Easy Hose Joint System and One Way Bleed port keep ongoing maintenance simple and mess-free.
• Flat-mount caliper: low-profile BR-RX810 two-piston caliper suits modern gravel and road frames with flat-mount disc brake bosses.

Lever and shift system

The ST-RX810 dual control lever handles both braking and 11-speed Shimano road shifting. The rotary brake axle is positioned 18 mm higher than a conventional design, working with SERVOWAVE to give the lever a light, positive feel. Gravel-specific hood geometry provides a secure grip whether you're on the hoods riding through loose terrain or reaching for the drops on a descent.

Front caliper

The BR-RX810 is a two-piston flat-mount hydraulic caliper running on Shimano mineral oil. The supplied L03A resin pad with cooling fin uses ICE TECHNOLOGIES to shed heat efficiently, maintaining consistent pad bite even on extended descents. The caliper is supplied with a 160 mm flat-mount front bracket.

Compatibility & fit

This is the right-hand lever / front caliper kit. In the Australian brake setup, the right lever operates the front brake. The ST-RX810 shifts 11-speed Shimano road-compatible drivetrain components. The BR-RX810 caliper uses flat-mount mounting and is supplied with a bracket assembled for a 160 mm rotor. Mineral oil fluid only — do not use DOT fluid. Compatible with Shimano 6-bolt or Center Lock disc rotors of the appropriate diameter.