The Shimano GRX ST-RX825 Di2 Dual Control Lever brings state-of-the-art semi-wireless electronic integration to gravel and mixed-terrain cycling. Engineered with gravel-specific ergonomics, these levers feature a rounded cross-section design that transitions seamlessly onto flared handlebars, maximizing contact area to reduce hand fatigue. The raised hood profile, ribbed surface texture, and anti-slip coating on the brake lever blades provide maximum security, whether you are tackling muddy fire roads or navigating technical, rocky descents.
Equipped with dual CR1632 coin batteries boasting a massive three to four years of lifespan, the ST-RX825 eliminates messy cockpit wiring while maintaining Shimano's hallmark lightning-fast shifting. Beyond standard controls, each lever integrates a gravel-specific third auxiliary button on the inner hood, fully customizable via the E-TUBE PROJECT application. These levers also introduce the innovative Front Shift Next functionality, allowing a single button to alternate your front derailleur position dynamically, alongside compatibility with up to three satellite shifter options for a highly personalized cockpit setup.
Wireless Di2 Precision: Delivers instantaneous, reliable 12-speed electronic shifting over rough terrain with a clean, wire-free cockpit layout.
Gravel-Optimised Ergonomics: Features raised, textured hoods and a specialized anti-slip brake lever coating for ultimate grip during wet or muddy conditions.
Flared Bar Integration: The hood body shape is specifically rounded and optimized to eliminate pressure points when mounted on modern flared drop bars.
Customisable Third Button: Built-in auxiliary buttons on the inside of the hoods can be programmed for shifting, controlling compatible bike computers, or cycling through GPS screens.
Front Shift Next Technology: Supports Shimano's latest firmware concept, allowing you to execute smart front derailleur shifts from a single designated button.
Extended Battery Life: Powered by two user-replaceable CR1632 coin cell batteries per lever, ensuring worry-free performance for roughly 3 to 4 years.
Series: Shimano GRX Di2 RX825
Speed: 12-Speed
Shifting Type: Electronic (Wireless transmission to rear derailleur)
Brake Type: Hydraulic Disc Brake (Recommended caliper: BR-RX820)
Fluid Type: Shimano Mineral Oil
Connectivity: 1 x SD300 port, 1 x Satellite shifter port (per lever)
Battery Type: 2 x CR1632 per lever (included)
Weight: 207g per lever
Adjustability: Reach Adjust & Free Stroke Adjust
✅ Why This IS For You
Flared Handlebar Users: The optimized body design sits perfectly at an angle on gravel-specific handlebars without creating awkward bumps under your tape.
Tech-Savvy Riders: Ideal if you love a personalized cockpit, allowing you to configure satellite shifters on the tops or drops and map custom actions to the hood buttons.
All-Weather Adventurers: Perfect for wet, muddy, or dusty Australian trails where mechanical cables can drag, degrade, or get jammed with grit.
Long-Distance Bikepackers: With an ultra-long battery life of up to 4 years in the shifters, you can head out on epic multi-day tours without charging anxieties.
❌ Why This May NOT Be For You
Mechanical Purists: If you prefer the tactile feel and field-reparability of traditional steel shift cables, electronic shifting may not suit your riding philosophy.
Budget-Conscious Builders: As a top-tier Di2 electronic component, it requires a higher financial investment compared to mechanical alternatives like the GRX RX820 series.
Strict 1x Drivetrain Loyalty: Optimized primarily around 2x12 systems and Front Shift Next technology, making some advanced button mapping redundant if you prefer a single chainring setup.
When installing the ST-RX825 levers onto highly flared gravel bars, wrap an extra 50mm strip of bar tape directly around the clamp band before starting your main wrap. Because these hoods are specifically rounded underneath to smooth out the transition on wide bars, the extra layer completely fills the gap and creates a perfectly flat, blister-free platform for your palms during long corrugated rides!
