DBA DBA4644 4000 Series HD Rear Plain Disc Brake Rotor

The DBA DBA4644 is a 4000 Series HD rear disc brake rotor engineered for drivers who demand upgraded braking performance beyond standard OE levels, with a smooth OE-style finish suited for street use and controlled race divisions alike.

Key Features:

• Kangaroo Paw Ventilation: Patented vane design featuring 144 diamond and teardrop patterned pillars delivers up to 30% more surface area and 20% improved cooling efficiency over traditional straight-vane rotors
• XG-150 High Carbon Alloyed Iron Construction: Premium metallurgy formulated to handle intense heat and stress generated under repeated, heavy braking applications
• Thermal Stability Profiling (TSP): Proprietary heat treatment cycles realign the microstructure of the iron, increasing rotor stability, durability, and resistance to thermal fatigue
• CBN Machine-Turned Finish: Cubic Boron Nitride machining minimizes disc thickness variation, reducing the potential for pad knock and premature wear
• Thermographic Heat Paint: Color-changing paint markings indicate specific temperature thresholds, allowing monitoring of braking temperatures and rotor fatigue over time
• HD (Plain) Rotor Style: Smooth OE-style rotor surface — no slots or drill holes — ideal for daily drivers and sanctioned race classes requiring stock-look rotors
• Black Painted Hat/Hub: Non-friction surfaces are painted to resist corrosion and improve appearance
• Solid Rotor Design: Rear solid disc configuration, manufactured in Australia to strict quality standards

Specifications:

• Outer Diameter: 266 mm (10.47 in)
• Nominal Thickness: 10 mm
• Minimum Discard Thickness: 8.5 mm
• Hub Height: 67.5 mm
• Center Bore: 58 mm
• Bolt Pattern: 5 x 100 mm
• Rotor Type: Solid (non-vented)
• Placement: Rear

The DBA4644 is a direct-fit, drop-in replacement rotor manufactured by Disc Brakes Australia (DBA), a globally recognized Australian designer and manufacturer of performance brake components. It is sold individually (per rotor). Cross-reference part numbers include: 120.47011, 121.47011, 122.47011, 123.47011, BD125046E, BR31043, PRT1474, and others.