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The GRX ST-RX600 Dual Control Lever with Caliper Set forms the Dual Control STI system mechanical shift/hydraulic disc brake use with GRX 11-speed The Right set is for the rear derailleur and rear disc brake. It can be used for both 1x and 2x GRX drivetrains. The Left set is for the front derailleur and front disc brake when using the 2x drivetrain. Each side is sold as a set, with lever and pre-bled housing assembly to the Flat Mount disc caliper. If you are building a 1x GRX bike, a GRX BL-RX600-L Left brake-only lever is available (BR-RX400 caliper sold separately). Shift wise, you get the smooth running Optislick stainless steel shift cable and OT-SP41 pre-lubed housing. The Right set also includes the required, more flexible OT-RS900 loop that must be used with the rear derailleur for proper rear shift action.

Shimano developed GRX components for the rough terrain and mixed surfaces that make gravel riding so challenging, fatiguing and fun. The shift/brake lever ergonomics make for easier leverage, hand positions, comfort and tactile use despite the constant vibration and small impacts of gravel riding. The lever blades feel correct and proper with a standard road drop bar shape, as well as the flared drop bars popular for gravel. Admittedly, they appear larger than Ultegra R8020 levers, but the increased size and variable shape of the levers definitely afford a real advantage on rough terrain, and deliver light, yet precise and positive shift action.

The set detail consists of the left-side ST-RX600 Dual Control Lever and front/rear appropriate BR-BR-RX400 Flat Mount hydraulic disc brake caliper with IceTech finned disc pads, and all necessary hardware. The system is pre-bled and connected with the SM-BH90-JK-SSR hydraulic hose system from lever to caliper. Shimano's Mineral Oil hydraulic system makes it fairly simple to set the proper housing length and bleed for best braking contact.

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  • 11-spd GRX 600 Dual Control Mechanical Shift / Hydraulic Brake assembly for GRX drivetrains
  • Lever exceptionally similar to GRX 800 version but NO ServoWave, Free Stroke brake lever features
  • Sold as a DC Lever, hose, Flat Mount Disc caliper for one side- Left or Right
  • Left assembly is Front control for 2x drivetrain, Right is for Rear- 1x or 2x drivetrains
  • Same light shifting operation as top tier road systems, SIS indexing
  • Responsive lever throw actions and light but positive engagement feel
  • Hood and lever shapes feature gravel specific ergonomics, texture
  • Raised hood head prevents hand misalignment and slippage
  • Anti-slip lever texture and brake lever coating
  • Recessed finger notch prevents upward slipping
  • Includes: Optislick cables, OT-SP41 housing, Right lever set includes OT-RS900 loop specifically for use with rear derailleur- required for proper rear shifts
  • Pre-bled hydraulic brake system from lever to caliper
  • GRX specific lever shape and design, will not match R8020 or others
  • Higher brake lever axis - curved brake lever improves braking input performance
  • Improved grip and confidence on choppy surfaces and descents
  • Higher braking efficiency reduces fatigue on long rides
  • Brake lever features Reach Adjust (tool required)
  • Flat Mount BR-RX400 hydraulic brake caliper with IceTech finned disc pads
  • SM-BH90-JK-SSR hydraulic hose system from lever to caliper
  • Materials: GFRP, Steel, Aluminum
  • Select Right (rear) or Left (front)
  • Finish: GRX 600 Black scheme
  • Weight: 306-307 grams
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