The Shimano GRX BL-RS717-L is a left-side hydraulic disc brake lever designed specifically for GRX Di2 gravel drivetrains. By leaving the shifting electronics to a right-side ST-RX715 dual control lever, this brake-only unit delivers a lighter, cleaner cockpit without compromising braking performance — ideal for gravel and cyclocross riders who want precise, modulated stopping power on long off-road days.

Highlights

• Brake-only design: Pairs with a GRX Di2 right dual control lever to create a clean, lightweight cockpit with no redundant electronics on the left.
• Servo Wave technology: Provides a quick initial braking response followed by progressive power delivery, giving confident modulation across all conditions.
• Tool-free Reach Adjust: Dial in lever reach to suit your hand size without tools — ideal for dialling in comfort on long gravel rides.
• Contact Point Adjust: Fine-tune the lever's contact point to match your preferred brake bite feel.
• GRX-matched ergonomics: Shaped to align perfectly with the GRX ST-RX715 right lever for a consistent grip experience across the bar.
• Mineral oil hydraulic system: Shimano's mineral oil hydraulics deliver reliable, low-maintenance braking performance in all weather.

Built for gravel

The GRX RX717 range is Shimano's accessible entry into 12-speed wireless Di2 gravel riding. The BL-RS717-L mirrors the lever shape and ergonomics of the ST-RX715 right-side dual control lever, so both hands feel equally at home on the drops. At 188g it keeps system weight low while the hydraulic circuit delivers the braking confidence that technical gravel demands.

Compatibility & Fit

Left-side brake lever for drop handlebars. Designed for use with Shimano GRX Di2 systems — pairs with the right-side ST-RX715 dual control lever and GRX hydraulic disc brake callipers (e.g. BR-RX410). Uses Shimano mineral oil (DOT fluid must not be used). In the Australian setup, the left lever operates the rear brake. Confirm compatibility with your frame's brake mount standard before purchasing.