ONIRII IIIPRO R2X4 MTB Hydraulic Disc Brake – Ultra Braking

ONIRII IIIPRO R2X4 MTB Hydraulic Disc Brake – Ultra Braking — High-performance 4-piston hydraulic disc brake designed for mountain bikes, offering precise modulation, strong stopping power, and durable aluminum construction for aggressive trail and enduro riding.

Features

• 4-piston vertical cylinder caliper for consistent, powerful braking
• Hydraulic brake pad system for smooth modulation and reduced lever effort
• Lightweight aluminum components for durability without excess weight
• Optimized for MTB use: responsive in wet, muddy, and technical conditions

Technical Details

• Braking System: Hydraulic Disc Brake (Hydraulic Brake Pad)
• Components: Caliper Brake
• Type: Hydraulic Disc Brake
• Material: Aluminum
• Model: R2X4 vertical cylinder, 4 piston

Package Includes

• R2X4 4-piston caliper assembly
• Brake pads
• Mounting hardware and seals

Warning / Advice

Install by a qualified mechanic. Bleed and bed pads before first ride. Check compatibility with rotors and mounts.

Benefits: The R2X4 improves rider confidence by delivering predictable deceleration and consistent feel under heavy loads. It reduces stopping distance on steep descents, minimizes lever fade on long rides, and increases control for technical lines — ideal for riders who demand durable, precise braking performance.

Perfect for mountain bikers tackling trail, enduro, and downhill, backed by a 2-year warranty. Add the ONIRII IIIPRO R2X4 to your build to upgrade braking power and control — install on your next service or project ride-ready.