DBA DBA5654.1 5000 Series HD Replacement Brake Disc Ring 326x30mm Front

The DBA DBA5654.1 is a 5000 Series HD replacement brake disc ring designed for two-piece rotor systems. This is the cast iron rotor ring only — sold individually as a direct replacement for worn rings in existing DBA 5000 Series two-piece rotor assemblies, allowing drivers to replace just the friction ring while reusing their aluminium hat.

The 5000 Series HD variant features a smooth OE-style plain finish, ideal for drivers who want the structural and thermal advantages of a two-piece rotor without slots, cross-drilling, or dimples.

Key Features:

• Two-piece composite design: High carbon cast iron rotor ring paired with a lightweight aerospace-grade T6061-T6 aluminium hat (hat sold separately)
• Disc size: 326mm diameter x 30mm height
• Maximum thickness: 30mm | Minimum thickness: 28mm
• Plain / HD smooth finish: OE-style surface with no slots or drilling
• Disc side: Left/Right (universal fitment)
• Material: Premium cast iron
• Reduced unsprung weight: Aluminium hat design lowers rotational mass for improved handling response
• Uniform radial expansion: Two-piece construction allows the cast iron ring to expand freely, reducing thermal stress and warping
• Reduced heat transfer: Aluminium hat acts as a thermal barrier, minimizing heat migration to the wheel hub and bearings
• NAS fasteners: National Aerospace Standards (NAS) bolts and crimp nuts secure ring to hat
• Torque spec: 13 Nm (9.6 ft-lb) for NAS nut and bolt assembly
• Package contents: 1x brake disc ring (ring only)

DBA recommends thoroughly inspecting the aluminium hat for wear and damage whenever replacing only the rotor ring. The 5000 Series is engineered for high-performance street driving, track days, club racing, and rally applications — delivering superior heat management and braking consistency compared to standard one-piece rotors.