Shimano ST-RX825 GRX Di2 STI Lever & BR-RX820 Rear Caliper – 12-Speed Hydraulic Braking and Shifting for Gravel

Engineered for demanding gravel adventures, the Shimano ST-RX825 right-hand Di2 STI lever and BR-RX820 rear caliper combo deliver wireless 12-speed shifting and powerful, quiet hydraulic braking. Whether you’re racing across rough terrain or riding long mixed-surface routes, this GRX pairing brings total control to your fingertips.

Gravel-Optimised Ergonomics & Control

The ST-RX825 lever features a raised hood profile, ribbed surface texture, and anti-slip coating for improved grip in all conditions. Designed for use with flared handlebars, it integrates seamlessly into your cockpit and supports satellite shifters via SD300 ports. The lever includes Shimano’s Front Shift Next customisation for programmable 2x control, powered by easily replaceable CR1632 batteries with a 3–4 year life span.

Refined Braking Performance

Paired with the flat-mount BR-RX820 rear caliper, this setup improves modulation and initial bite point while reducing brake noise. The updated caliper features 10% wider pad clearance and Shimano’s One Way Bleeding for easier maintenance. Despite its lighter weight, it’s built for endurance with full Ice Technologies compatibility and secure multi-length mounting options.

PRODUCT SPECIFICATIONS

• Lever Model: ST-RX825-R
• Series: Shimano GRX 2×12-speed Di2
• Shifting: Wireless Di2 electronic
• Brake Type: Hydraulic disc
• Lever Features: Textured hood, anti-slip coating, satellite shifter support (SD300), Front Shift Next
• Caliper Model: BR-RX820-R
• Mount Type: Flat mount
• Piston: 2
• Pad Standard: L05A-RF Resin (w/ fin)
• Pad Options: K05S-RX Resin (w/o fin), L04C-MF Metal (w/ fin)
• Brake Hose: SM-BH90-JK-SSR, Straight connection
• Oil: Shimano Mineral
• Bleeding System: One Way Bleeding
• Reach Adjust / Free Stroke: Yes
• Recommended Rotor: RT-CL800

Looking for Shimano GRX Di2 brakes and levers in Perth? Visit George’s Bike Shop Balcatta – WA’s trusted Shimano dealer for gravel-specific Di2 shifting and braking systems.

ABOUT SHIMANO

Shimano is committed to delivering world-class performance through innovation, precision, and reliability. From everyday commuters to elite gravel racers, Shimano components empower riders to explore, race, and conquer new terrain with confidence.

Shimano Australia