Shimano GRX Di2 ST-RX825 2x12 Hydraulic Shift Brake Lever Set

€409,95 EUR

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The Shimano GRX Di2 ST-RX825 Dual Control Lever Set (with with BR-RX820 Callipers) combines wireless 12-speed electronic shifting, powerful hydraulic braking and gravel-specific ergonomics, making it one of the most refined cockpit upgrades available for performance gravel, adventure and endurance riding on Australian roads, gravel tracks and mixed terrain.

GRX Di2 ST-RX825 with BR-RX820 Features

• Semi-wireless 12-speed Di2 shifting for fast, precise and highly reliable gear changes
• Gravel-specific hood shape with raised hoods for superior comfort and control on rough terrain
• Hydraulic disc brake levers with Servo Wave technology for improved braking modulation and power
• Anti-slip brake lever coating and textured hood surfaces for confidence in wet, dusty and harsh conditions
• Compatible with Shimano satellite shifters and Front Shift Next customisation functions

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Shimano GRX Di2 Dual Control Lever Set

Model: ST-RX825-L + ST-RX825-R
Drivetrain Compatibility: Shimano GRX Di2 2x12-speed
Shifting System: Wireless Di2 electronic shifting
Brake Type: Hydraulic disc brake
Caliper: Shimano BR-RX820
Brake Hose: SM-BH90-JK-SSR
Brake Fluid: Shimano Mineral Oil
Reach Adjustment: Yes
Satellite Shifter Compatibility: SW-RS801 series
Handlebar Clamp Diameter: 23.8-24.2 mm
Battery Type: CR1632 x 2 (per lever system)
Estimated Battery Life: Approximately 3 to 4 years under normal use
Firmware Updates: Shimano E-Tube Project Compatible
Hose Joint: Straight
Colour: Shimano Series Colour

Shimano Di2 Wireless Technology

The ST-RX825 adopts Shimano's latest semi-wireless Di2 architecture. Shift inputs are transmitted wirelessly from the levers while maintaining a highly secure and reliable drivetrain ecosystem. This provides cleaner cockpit aesthetics and simplified installation compared with previous generations.

Gravel-Specific Ergonomics

Unlike traditional road levers, GRX hoods are taller and feature a more secure shape designed specifically for uneven surfaces. Riders gain greater hand support and control when riding corrugated gravel roads, loose corners and rough descents.

Servo Wave Hydraulic Braking

Borrowed from Shimano's high-performance braking systems, Servo Wave technology increases brake power while maintaining modulation and control. Riders benefit from stronger braking with less hand fatigue during long descents.

Anti-Slip Lever Construction

The brake lever surface features an anti-slip coating, enhancing grip during wet weather, dusty rides and endurance events.

Optimised for Flared Handlebars

The hood profile has been redesigned to integrate seamlessly with modern gravel handlebars, especially wide and flared drop bars commonly used for Australian gravel racing and bikepacking.

Customisable Shifting Functions

Through Shimano E-Tube software, riders can customise button assignments, shifting patterns and satellite shifter integration to suit personal preferences.

Lever position: Left and right
• Handlebar type: Drop handlebar
• Clamp compatibility: 23.8-24.2 mm handlebar clamping section
• Preferred application: Gravel and all-road handlebars
• Flared handlebar compatibility: Optimised for modern flared drop bars
• Reach adjustment: Individually adjustable
• Free-stroke adjustment: Individually adjustable
• Shift-button configuration: Customisable through Shimano E-Tube Project
• Brake-hose routing: Internal or external, subject to frame and handlebar compatibility

The lever bodies are intended for standard drop-bar clamping dimensions. They are not designed to clamp directly onto flat handlebars or oversized 31.8 mm handlebar centre sections.

For the best hood transition, lever position and brake access, professional installation is recommended, particularly when using internally routed handlebars or heavily flared gravel bars.

The Shimano GRX Di2 ST-RX825 Dual Control Lever Set is best suited to performance gravel riders, endurance cyclists, gravel racers and experienced bikepackers who want faster shifting with less hand movement and more control from the hoods.

Care instructions

• Wash the levers using water, mild bicycle cleaner and a soft cloth
• Do not direct a high-pressure washer at the lever pivots, hood openings, buttons or brake-hose connections
• Inspect brake hoses, fittings and lever bodies after crashes or heavy impacts
• Use only genuine Shimano mineral oil in the hydraulic brake system
• Do not allow mineral oil, chain lubricant or cleaning chemicals to contaminate brake pads or rotors
• Check lever-battery status through the appropriate Shimano system functions
• Replace batteries with the specified CR1632 type and observe correct polarity
• Replace both batteries in an individual lever at the same time
• Keep Shimano E-Tube firmware current and verify button assignments after an update
• Have the brakes bled when lever feel becomes inconsistent or whenever the hydraulic system is opened
• Follow Shimano’s prescribed clamp, hose and bleed procedures during installation
• Periodically inspect handlebar clamp security using a correctly calibrated torque wrench

Australian warranty information

Shimano Australia provides a two-year limited warranty for GRX bicycle components purchased new in Australia by the original retail purchaser, subject to its conditions and exclusions.

Velo published its first-ride review of Shimano GRX Di2 RX825 on 23 May 2024 after testing the groupset over approximately 80 miles of chunky climbs, sandy descents, water crossings and singletrack. Reviewer Will Tracy praised the quality of the shifting, assured brake performance and comfort of the raised hoods during rough and extended rides. He also identified the programmable auxiliary buttons as a useful addition, particularly when configured for front shifting. The main reservations concerned the system being limited to a 2x drivetrain at launch, a slight delay on the first shift after the bike had been inactive and the lack of a matching Shimano power-meter option.

Off-road.cc followed with a first-ride report on 12 July 2024 after using the groupset on the white gravel sectors associated with Stage 9 of the 2024 Tour de France. Its test reinforced the value of the 2x12 drivetrain for riders who want closely spaced gears for faster terrain without giving up a practical climbing range. The review also noted the familiarity and refinement of the system rather than presenting RX825 as a radical departure from Shimano’s established Di2 platform.

Shimano GRX Di2 ST-RX825 versus SRAM Force AXS controls

The GRX levers are shaped specifically for gravel use and offer raised, textured hoods, Servo Wave braking and integration with a close-ratio 2x12 drivetrain. This makes them particularly attractive to riders who combine fast sealed roads with gravel climbs and want smaller cadence changes.

SRAM Force AXS offers a fully wireless drivetrain architecture and simple two-button shift logic. It is a strong alternative for riders who prefer SRAM’s battery system or want broad access to 1x XPLR configurations. However, braking feel, hood shape and mineral-oil versus DOT-fluid servicing will influence personal preference.

Shimano GRX Di2 ST-RX825 versus Shimano Ultegra Di2 ST-R8170

Ultegra Di2 controls are lighter and oriented towards road racing, aerodynamic road cockpits and sealed-surface performance. They are a logical choice for a dedicated road bike.

The GRX levers provide taller hoods, more pronounced surface texture, anti-slip lever treatment and a shape developed for flared gravel handlebars. They are the better choice when off-road control and secure hand placement take priority over minimum road component weight.

Shimano GRX Di2 ST-RX825 versus Shimano GRX ST-RX820 mechanical controls

GRX ST-RX820 mechanical levers provide much of Shimano’s proven gravel ergonomics without electronic shifting or coin-cell batteries. They cost less, are easier to troubleshoot in remote locations and suit riders who prefer a fully mechanical drivetrain.

The RX825 levers deliver lighter-action electronic shifts, extensive button customisation, satellite control options and a cleaner shift-cable-free cockpit. They are the more compelling option for racing, premium bike builds and riders who want consistent shifting with minimal lever effort.

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