Shimano GRX BR-RX820 rear hydraulic brake caliper 2 pistons 2025

The Shimano GRX BR-RX820 is a rear hydraulic disc brake caliper specifically designed for gravel riding and road adventure, offering precise control, consistent braking power, and reliability even in the most demanding conditions.

Features

Smooth and predictable braking, ideal for mixed terrain
Optimized for gravel use, but also perfectly suited for touring or endurance setups
Full compatibility with GRX 12-speed systems, ensuring a seamless connection between lever and caliper

Technical Specifications

Type: Rear hydraulic disc brake caliper
Compatibility: Shimano GRX Di2 mechanical/electronic groupset (RX820 series)
Pistons: 2 opposed pistons for powerful and modulated braking
Mounting: Flat Mount – compatible with most modern gravel and road bike frames
Material: High-strength aluminum for an ideal balance of lightness and durability
Shimano ICE Technologies: Excellent heat dissipation to reduce the risk of overheating on long descents
Pad Compatibility: Organic or metallic pads, with or without cooling fins
Maintenance: One Way Bleeding system for quick and easy bleeding procedure

Included

1x Shimano BR-RX820 rear brake caliper
1x Set of mounting bolts
Pre-installed brake pads