Shimano GRX Di2 ST-RX815 11Speed

Gravel Ergonomics. Digital Precision.

The ST-RX815 stands out with its distinct gravel-specific lever hood geometry. The hood head is taller to prevent your hands from sliding forward on bumpy descents, and the lever pivot point is moved upward to provide higher braking leverage from the hoods. Game changing for technical off-road sections. Combined with the instantaneous, "clicky" feel of Di2 shifting, these levers allow you to hold your line with total confidence while clicking through gears effortlessly.

Why the ST-RX815 is the Gravel Gold Standard:

• Gravel-Specific Ergonomics: The hood shape is optimized for flared gravel bars, providing a flat, secure palm rest and an anti-slip texture that stays grippy even when covered in mud or sweat.

• Higher Braking Axis: By moving the lever pivot point up, Shimano has reduced the effort required to slow down. You get more "bite" with less finger strength, reducing hand fatigue on long, vibration-heavy rides.

• Servo Wave Action: Inherited from Shimano’s elite mountain bike brakes, Servo Wave technology provides rapid pad engagement and then increases power through the stroke for incredible modulation and control.

• Instant Di2 Shifting: Eliminates the "throw" of mechanical levers. A light tap is all it takes to shift, ensuring you never miss a gear change because of frozen fingers or rough washboard roads.

• Customizable Functionality: Use the E-TUBE PROJECT app to customize shift button functions, adjust shifting speed, or set up "Synchronized Shifting" to control both derailleurs with a single hand.

• Reach and Free Stroke Adjust: Every rider is different. The RX815 allows you to perfectly dial in the distance from the handlebar to the lever, ensuring a comfortable fit for all hand sizes.

Technical Specifications:

• Model: ST-RX815 (Left/Right)

• Series: GRX DI2

• Shifting Type: Electronic (Di2)

• Brake Type: Hydraulic Disc

• Speed: 11Speed (Compatible with GRX 800 Di2 components)

• Weight: ~285g (per pair)

• Connectivity: E-Tube SD50 port

The Alegro Perspective: In the shop, we call this the "anti-fatigue" lever. If you’re riding a 100-mile gravel race, the ergonomic shape and the low effort of the Di2 buttons keep you fresh in the final hour. It’s significantly more secure in the hand than an Ultegra lever when things get bouncy. It’s the single best upgrade you can make to a gravel bike like the Brodie Romax Adventure to transform the handling and shift quality.

Rugged Grip. Instant Response. Master the Gravel with Shimano GRX Di2.