Short Description
The Shimano GRX Di2 RD-RX815 Rear Derailleur is a precision-engineered 11-speed electronic rear derailleur designed specifically for gravel and mixed-terrain riding. Featuring Shimano’s Shadow RD+ chain stabiliser and Di2 electronic shifting technology, it delivers fast, reliable gear changes and improved chain control on rough roads and off-road surfaces.
Key Features
- Electronic Shifting: Shimano Di2 technology provides fast, precise and consistent gear changes
- Chain Stability: Shadow RD+ clutch mechanism reduces chain slap and improves drivetrain security on rough terrain
- Gravel Optimised: Designed specifically for gravel and endurance road riding
- Wide Compatibility: Suitable for 2x11-speed drivetrains with cassette sizes up to 34T
- Low Profile Design: Compact Shadow design helps protect the derailleur from impacts and improves durability
Product Overview
The Shimano GRX Di2 RD-RX815 Rear Derailleur is built to handle the demands of gravel riding, bikepacking and endurance road cycling. Its electronic shifting system ensures smooth and accurate gear changes even under load, while the integrated chain stabiliser improves chain retention and reduces noise on uneven surfaces. Designed as part of Shimano’s GRX platform, it combines rugged reliability with refined performance, making it an ideal upgrade or replacement component for modern gravel drivetrains.
Specifications
- Brand: Shimano
- Series: GRX
- Model: RD-RX815
- Speed: 11-speed
- Technology: Di2 electronic shifting
- Design: Shadow RD+ with clutch
- Drivetrain: 2x (double chainring)
- Max Cassette Size: 34T
- Mount Type: Direct mount compatible
- Use: Gravel, road, endurance riding
- Colour: Series grey
Ideal For
- Gravel and adventure bikes
- Electronic (Di2) drivetrain upgrades
- Endurance road and mixed-terrain riding
- Riders seeking precise, low-maintenance shifting performance
What’s Included
- 1 × Shimano GRX Di2 RD-RX815 Rear Derailleur
Care & Notes
Ensure compatibility with Shimano Di2 systems and 2x11-speed drivetrains before installation. Regular drivetrain cleaning and correct adjustment will help maintain optimal shifting performance and component lifespan.
Why Buy From LK Bikes
LK Bikes offers genuine Shimano components backed by expert advice, workshop support and dependable aftersales service.
