Shimano Di2 FD-RX815-F Front Derailleur, Double Down Swing, Braze-On – 2x11-Speed Gravel

The Shimano Di2 FD-RX815-F front derailleur is designed to deliver fast, smooth, and precise shifting even under high pedaling loads. Part of the Shimano ULTEGRA RX family, it combines the precision of Di2 electronic shifting with features specifically designed for gravel drivetrains, ensuring reliability on mixed terrain and in the most demanding conditions.

The Down Swing design with braze-on mounting is designed to integrate with compatible frames, while the increased chainline provides more clearance for wider tires compared to traditional road configurations.

The derailleur supports a wider range of gear combinations, with a maximum chainring difference of 17 teeth, and features programmable chainring trim settings to optimize drivetrain performance. It is also compatible with Shimano SYNCHRONIZED SHIFT Full and Semi modes for coordinated gear changes.

Features and benefits

• Shimano Di2 electronic shifting: fast, smooth, and precise gear changes even under high pedaling loads.
• Designed for gravel: engineered to deliver reliable performance on mixed terrain and challenging routes.
• Wide-range chainring compatibility: supports a tooth difference of up to 17 teeth between chainrings.
• More tire clearance: chainline is 2.5 mm wider than that of a traditional road derailleur.
• Programmable chainring trim: preset settings to help ensure the chain is correctly positioned during operation.
• Shimano SYNCHRONIZED SHIFT: compatible with Full and Semi synchronized shifting modes.
• Down Swing design: specifically designed for frames compatible with this type of derailleur.
• Braze-on mounting: installs on frames equipped with a braze-on mount.

Technical specifications

• Brand: Shimano
• Series: ULTEGRA RX
• Model: FD-RX815-F
• Type: electronic front derailleur
• Shifting technology: Shimano Di2
• Configuration: double chainring (2x)
• Movement: Down Swing
• Mounting: braze-on
• Maximum chainring difference: 17 teeth
• Chainline: +2.5 mm compared to a traditional road derailleur
• Trim adjustment: programmable chainring settings
• Shifting modes: Shimano SYNCHRONIZED SHIFT Full and Semi
• Use: Gravel and mixed terrain

Compatibility and installation

The Shimano Di2 FD-RX815-F derailleur is designed for Shimano Di2 electronic drivetrains with double chainrings and frames equipped with braze-on mounting.

Before purchasing, check compatibility with the installed drivetrain, Di2 electronic system, crankset, and frame. Also ensure that the tooth difference between the chainrings does not exceed 17 teeth and that the configuration meets the derailleur's specifications.

Why choose the Shimano Di2 FD-RX815-F?

The Shimano FD-RX815-F front derailleur is a solution for those who want the precision of electronic shifting even when riding gravel. Its increased tire clearance, support for chainrings with a tooth difference of up to 17 teeth, and Shimano SYNCHRONIZED SHIFT features make it suitable for double chainring drivetrains designed to tackle varied terrain.

Choose the Shimano Di2 FD-RX815-F derailleur for precise, smooth front shifting with features designed for gravel riding.