The Shimano GRX RD-RX820 is a top-tier, race-ready gravel derailleur engineered specifically for the latest generation of 1x12-speed drivetrains. It features a fast, optimized shifting gate layout and an integrated chain stabilizer, delivering whisper-quiet performance, sharp mechanical engagement, and robust security over unpredictable, rugged terrain.
Key Technical Specs:
Drivetrain Compatibility: Dedicated 1x12-Speed setups (optimized for GRX ST-RX820 shifters).
Cassette Range Compatibility: Engineered specifically for wide-range gravel configurations:
Minimum Low Sprocket: 45T
Maximum Low Sprocket: 51T (Perfect match for a 10-45T or 10-51T 12-speed cassette layout).
Top Sprocket Max/Min: 10T
Average Weight: 290g
Total Capacity: 41T
Link Bushings: 4 fluorine-coated link bushings for low-friction, long-lasting pivot performance.
Product Highlights:
Shadow RD+ Clutch System: Features an integrated, low-profile mechanical clutch on/off switch. Turning the clutch on applies high spring resistance to the cage pivot, neutralizing heavy chain slap, minimizing noise, and ensuring zero dropped chains over technical roots or corrugations.
Gravel-Optimized Kinematics: Specifically fine-tuned to balance the light shifting feel of a road lever with the chain-retaining authority needed for demanding off-road conditions.
Low Profile Body Layout: The aggressive Shadow design contours closely underneath the rear dropout and cassette body, protecting the vital linkages from gravel spray, track debris, and impact hazards.
Pricing & Availability:
Price: 14,500 KSh
Condition: Brand New In Box (unmounted, pristine cage and pulley wheels, as pictured).
