Shimano

Left GRX BL-RX825 Lever with BR-RX820 Hydraulic Disc Brake Caliper

Shimano GRX BL-RX825 left brake lever with BR-RX820 hydraulic disc brake caliper is a focused gravel braking setup for riders running GRX Di2 who want a dedicated left-side brake lever to pair with a right ST-RX825 dual control lever. The lever shape, hood texture, and anti-slip lever coating are built around mixed-terrain control—especially when hands are on the hoods and the bar is flared—while the RX820 flat mount caliper delivers stronger modulation and a quicker initial braking point with noise-reducing pad clearance and service-friendly maintenance features.

Braking and control details that matter off-road

1. Left brake-only GRX Di2 lever - A lighter, simpler left-side option that complements a right ST-RX825 dual control lever when a dedicated brake lever is the cleanest setup
2. Raised hoods with textured grip - Ribbed surface texture and a secure hood shape improve control on rough gravel when grip and stability matter most
3. Anti-slip lever coating - Adds confidence in wet, dusty, or gloved riding by helping fingers stay planted under braking
4. Flared handlebar integration - Hood body is optimized for a seamless fit with flared bars commonly used for gravel and mixed-terrain riding
5. BR-RX820 2-piston flat mount caliper - Enhanced modulation with a quicker initial braking point for better speed control on variable surfaces
6. Quieter, easier-to-service hydraulic system - 10% wider pad clearance helps reduce brake noise; one-way bleeding supports faster, cleaner maintenance, and the caliper includes finned L05A resin pads for heat dissipation plus a 140/160mm bracket (assembled for 160mm)