The Shimano GRX ST-RX820 is a left-hand dual control lever combining 2x12-speed mechanical shifting with hydraulic disc braking in a single ergonomic unit — built specifically for gravel and mixed-terrain riders who demand performance and control in all conditions.

Highlights

• Servo Wave hydraulic braking: Delivers fast initial pad engagement followed by progressive, powerful braking through the lever stroke.
• Gravel-optimised ergonomics: Lever hood profile is shaped to work naturally with flared handlebars, reducing palm pressure on long rides and rough terrain.
• Anti-slip lever surface: Textured brake lever blade — a technology borrowed from Shimano's fishing division — maintains a secure grip in wet and muddy conditions.
• Reach adjust: Tool-accessible reach adjustment lets you set the lever distance from the bar to suit your hand size and riding style.
• Mineral oil hydraulics: Sealed hydraulic circuit uses Shimano mineral oil for consistent, fade-resistant braking without the hazards of DOT fluid.
• 2x12-speed shifting: Left lever handles front derailleur actuation for double chainring setups, compatible with GRX RX820 12-speed drivetrains.

GRX RX820 Platform

The RX820 is Shimano's flagship 12-speed GRX groupset, designed from the ground up for gravel cycling. The ST-RX820-L builds on the proven GRX platform with updated lever ergonomics and refined hydraulic performance, maintaining the reliability that made the original GRX a benchmark for mixed-terrain riding.

Compatibility & Fit

Designed for 2x12-speed drivetrains. Works with the Shimano GRX FD-RX820 front derailleur and pairs with the ST-RX820 right-hand lever for a complete STI system. Compatible with Shimano hydraulic disc brake calipers including BR-RX820, BR-R9270 (Dura-Ace), BR-R8170 (Ultegra), BR-R7170 (105), and BR-RX400. Requires Shimano mineral oil. Left-hand lever only — right lever sold separately.