Shimano GRX RD-RX815 11-Speed Rear Derailleur

The Shimano GRX RD-RX815 rear derailleur brings the precision of Shimano Di2 electronic shifting to your 11-speed drivetrain. Engineered for mixed terrain, it ensures smooth and accurate gear changes, enhancing your ride experience on gravel, trails, or roads.

Chain Stabilizer for Quiet Rides: Integrated with a chain stabilizer mechanism, the RD-RX815 minimizes chain slap and provides a quieter, more secure ride. For smoother surfaces, the On/Off switch lets you disable the stabilizer, adapting effortlessly to your riding environment.

Optimized for Gravel and Adventure: Designed specifically for gravel and adventure riding, the derailleur is compatible with road cassettes featuring a maximum 34T low sprocket, providing a wide gear range for tackling varied terrain with confidence.

Durable and Versatile Performance: Built with robust materials and Shimano's proven engineering, the RD-RX815 delivers reliable performance in challenging conditions. Its rugged design ensures it can handle rough trails while maintaining top-notch functionality.

The RD-RX815 supports Shimano's synchronized shifting technology, allowing seamless communication between front and rear derailleurs for optimal gear selection.

Features

• Seamless Shifting Performance: Delivers silent and reliable rear shifting on rough terrain for uninterrupted rides.
• Chain Stabilization System: Adjustable chain stabilizer prevents chain slapping and drops, with an On/Off switch to adapt to varying terrains.
• Gravel-Specific Tuning: Features gravel-tuned clutch tension for better chain control on mixed surfaces.
• Wide Compatibility: Works with 11-speed road Dual Control Levers for versatile setups and smooth operation.
• Optimized Gear Range: Supports a maximum front difference of 17T, top sprocket max. 11T, low sprocket max. 34T, and a total capacity of 38T.

Technology

• Shimano Shadow RD+: Minimizes distractions with a quieter drivetrain, reducing chain slap and preventing chain drops. Lighter and more efficient than roller-type chain devices, it ensures reliable and smooth performance.

Specifications

• Model No: RD-RX815
• Series: GRX
• Color: Series Color
• Rear Speeds: 11
• RD Construction|Shimano Shadow RD+: Yes
• Mount|Direct Attachment (Conventional): Yes
• Mount|Direct Mount: Yes
• Max. Front Difference: 17T
• Total Capacity: 38T
• Low Sprocket|Max.: 34T
• Low Sprocket|Min.: 30T
• Top Sprocket|Max.: 11T
• Top Sprocket|Min.: 11T
• Fluoric Coated Link Bushings: 4
• Pulley|Guide Pulley Bearing: Sealed Bearing
• Pulley|Tension Pulley Bearing: Sealed Bearing
• Pulley|Teeth: 13T
• B-Axle|Hollow Axle: Yes
• Di2 Connectivity Wired|Di2 Shifting: Yes
• Firmware Update by E-Tube Project: Yes
• SD50 Port (Pcs): 1
• SD300 Port (Pcs): 0
• SD50 Connector (Pcs): 0
• SD300 Connector (Pcs): 0
• Average Weight: 287 g