Precision electronic shifting and powerful hydraulic braking in a single gravel-optimised package. The Shimano GRX ST-RX815 Di2 right-hand lever combines 11-speed electronic Di2 shifting with a fully hydraulic disc brake, while the included BR-RX810 front flat-mount caliper delivers consistent, fade-resistant stopping power on any surface.

Highlights

  • GRX Di2 electronic shifting — precise, programmable 11-speed control via the E-TUBE app
  • Integrated hydraulic disc brake with mineral oil — consistent feel, easy maintenance
  • Raised brake lever axis (18 mm higher than road levers) for greater braking efficiency from the drops
  • SERVOWAVE technology delivers powerful initial engagement with refined modulation as the lever is pulled
  • Tooled reach adjust accommodates a wide range of hand sizes
  • Raised hood head and recessed finger notch prevent hand slip on rough terrain
  • BR-RX810 flat-mount caliper with Shimano ICE Technologies and finned resin pads for superior heat management
  • One-Way Bleed system simplifies hydraulic maintenance
  • Anti-mud caliper design for reliable performance in mixed conditions
  • Comes pre-bled with 1700 mm hose ready to install

GRX Di2 Electronic Shifting

The ST-RX815 is purpose-built for gravel and adventure riding. Two E-Tube ports per lever integrate seamlessly with Shimano's Di2 electronic drivetrain ecosystem, enabling customisable shift function mapping via the E-TUBE app. D-FLY wireless connectivity (with optional EW-WU111 unit) allows real-time system monitoring and wireless configuration from your smartphone or Garmin-compatible head unit.

Hydraulic Braking & Heat Management

The BR-RX810 flat-mount caliper pairs Shimano ICE Technologies with finned resin (L03A) pads to dissipate heat efficiently on long descents. The caliper's low-profile, anti-mud design keeps performance consistent in wet and dirty gravel conditions. Hydraulic mineral oil provides a firm, consistent lever feel that doesn't fade with temperature changes.

Ergonomics for Gravel

GRX levers are designed from the ground up for the demands of off-road drop-bar riding. The higher brake axis reduces hand fatigue when braking from the drops, while the textured, anti-slip hood surface maintains grip on rough terrain. Adjustable lever reach means the ST-RX815 can be dialled in for any rider's hand size without specialised tools.

Compatibility & Fit

This is the right-hand lever supplying front brake hydraulic control and rear Di2 electronic shifting signals. Compatible with Shimano Road Di2 front and rear derailleurs (11-speed). Requires a standard 23.8–24.2 mm inner-diameter drop handlebar clamp. Flat-mount brake caliper fits standard gravel and road disc frames. Rotor not included — compatible with Shimano Centre Lock and 6-bolt rotors (140 mm or 160 mm recommended). Mineral oil only; do not use DOT fluid.

Shimano components are backed by Shimano Australia's manufacturer warranty against defects in materials and workmanship from the date of purchase. Coverage requires proof of purchase from an authorised Australian Shimano dealer. The warranty does not cover damage resulting from misuse, improper installation, lack of maintenance, or normal wear. For warranty support, return the item to Tune Cycles.

  • Shimano GRX Di2 right-hand dual control lever (ST-RX815) with front hydraulic disc brake
  • BR-RX810 flat-mount hydraulic disc brake caliper included, pre-bled with 1700 mm hose
  • 11-speed Di2 electronic shifting compatibility
  • SERVOWAVE progressive braking leverage for powerful initial bite and refined modulation
  • Brake lever axis positioned 18 mm higher than road levers for improved efficiency from the drops
  • Tooled reach adjust for rider-specific lever distance
  • Two E-Tube ports per lever for Di2 wiring and accessory connectivity
  • Shimano ICE Technologies and finned resin pads on caliper for heat dissipation
  • One-Way Bleed system for simplified hydraulic maintenance
  • Anti-mud caliper specification for reliable mixed-terrain performance
  • Hydraulic mineral oil system — consistent feel independent of temperature
  • Raised hood head and recessed finger notch for improved grip security
  • Handlebar clamp: 23.8–24.2 mm inner diameter
  • Colour: Black
ComponentDetail
Lever modelST-RX815 (right-hand)
Caliper modelBR-RX810 (front)
GroupsetShimano GRX Di2
Shifting typeElectronic Di2
Speed11-speed
Brake typeHydraulic disc
Hydraulic fluidMineral oil
Caliper mountFlat mount
Brake padsResin (L03A finned, included)
Hose length1700 mm (pre-bled)
Handlebar clamp23.8–24.2 mm inner diameter
E-Tube ports2 per lever
ColourBlack
Rotor compatibilityCentre Lock or 6-bolt (sold separately)
SKU SHM-IRX815DRF6SC100
Barcode # 4550170448950
Brand Shimano
Shipping Weight 0.3000kg
Shipping Cubic 0.001000000m3
Unit Of Measure each

Must be installed and serviced by qualified bicycle mechanic

More From This Category