Shimano GRX FD-RX815 Di2 Front Derailleur, 11-Speed, Down Swing, Braze-On

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Shimano GRX FD-RX815 Di2 Front Derailleur, 11-Speed, Down Swing, Braze-On
About This Item
Shimano GRX FD-RX815 Di2 Front Derailleur – 11-Speed, Down Swing, Braze-On
The Shimano GRX FD-RX815 Di2 Front Derailleur is purpose-built for gravel and adventure cycling, delivering smooth, reliable electronic shifting across mixed terrain. Designed for 2x GRX Di2 drivetrains, this front derailleur features a down-swing, braze-on design with optimized geometry for wider tire clearance. Engineered to accommodate chainstay angles of 61–66° and top gears of 46–50T, it ensures precise, consistent shifts for 11-speed drivetrains in rugged conditions.
Why you’ll like it
GRX-specific design – engineered for gravel and adventure performance.
Di2 electronic shifting – delivers precise, reliable shifts at the push of a button.
Braze-on mount – lightweight and clean installation.
Down-swing configuration – optimized for frame compatibility and wide tire clearance.
Supports 46–50T top gear – ideal for gravel and endurance gearing setups.
Chainline: 46 mm – designed to match GRX 2x drivetrains.
What’s in the box
1 × Shimano GRX FD-RX815 Di2 Front Derailleur (braze-on, down swing)
Tech specs
Manufacturer Shimano
Series GRX
Model FD-RX815
Manufacturer Part # KFDRX815F
Speed 11-speed (front)
Mount Type Braze-on
Configuration Down swing
Chainstay Angle 61–66°
Top Gear Capacity 46–50T
Chainline 46 mm
Application Gravel / Adventure / Endurance road (Di2 electronic)
Fit notes
Designed for Shimano GRX Di2 2x 11-speed drivetrains.
Requires Di2 wiring and shifters (sold separately).
Braze-on mount; an adapter may be required for clamp-style frames.
Compatible with top gear chainrings between 46–50T.
Specifications
Brand Shimano
Condition New
Part type Front Derailleur
Bike type Gravel
Size 11-Speed
Colour Silver
Manufacturer part number 600827
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