Girodisc 380x33 Front Brake Discs for Honda NSX (2016–2022)

The Girodisc A1-174 front brake discs, measuring 380 × 33 mm, enhance braking endurance during sustained use on Honda NSX models (2016–2022). Their cast-iron rotors and aluminum hubs form a floating assembly designed to manage thermal stresses and facilitate rotor replacement due to wear. Sold as a pair, including one left-side and one right-side rotor.

These rotors are intended for the front axle of compatible vehicles in the configuration shown below. They retain the compatible caliper mounting; any required spacers and pad specifications must be followed.

The cast iron track and floating connection allow the disc to accommodate differences in thermal growth between its two parts and to center itself between the brake pads. This construction also makes it easier to replace the tracks when they are worn.

The hub is made of 6061-T6 aluminum.

New brake pads must be installed with new rotors or new track sections. Their shape and compound must match the mounting configuration, the cast iron, and the intended use; follow the specific requirements for this part number and perform the prescribed break-in procedure.

On compatible vehicles originally equipped with carbon-ceramic rotors, this pair provides a conversion solution to high-quality cast-iron rotors. It allows you to remove and store the expensive original carbon-ceramic rotors to preserve them during heavy use, while reusing compatible calipers. Use new brake pads suitable for cast iron and adhere to the pad shapes and any spacers specified by the part number. Replaceable brake pads reduce the cost of replacing braking surfaces in heavy-duty applications and offer a choice of trims to tailor bite and pedal reaction to the intended use.

Specifications for Girodisc A1-174 rotors for compatible vehicles

• Brand: Girodisc
• PartNumber: A1-174
• Position: front
• Sizes (diameter × thickness): 380 × 33 mm
• Vehicles and models: Honda NSX (2016–2022)
• Braking surface material: high-resistance cast steel
• Packaging: Pair of complete rotors, one left and one right with disc bells.
• Hub: 6061-T6 aluminum
• Construction: two-piece floating mounting design
• Catalog part number: D1-174. Verify compatibility with the caliper generation before replacement.
• Minimum thickness: 31 mm
• Manufacturing of main components: United States

Vehicles compatible with Girodisc part number A1-174

• Honda NSX (2016–2022)

• Honda NSX (2016–2022): Original equipment cast iron or carbon-ceramic rotors; brake pads in the front with shape D1405 and brake pads in the rear with shape D1001.
• Honda NSX (2016–2022): D1405-shaped front brake pads are required for both cast iron and carbon-ceramic brake disk versions.

Each application is subject to its specific brake system configuration, calipers, and any requirements for brake pads or spacers. Please verify these requirements before ordering.

Girodisc A1-174 Mounting Requirements

• Honda NSX (2016–2022): Original equipment cast iron or carbon-ceramic rotors; D1405-shaped pads in the front and D1001-shaped pads in the rear.
• Honda NSX (2016–2022): D1405-shaped front brake pads are required for both cast iron and carbon-ceramic brake disk versions.

Brake Pads and Brake Systems for Compatible Vehicles

Choose brake pads with a shape compatible with the calipers, track, and/or A1-174 rotors, and with a compound suitable for sport driving or track use. The Endless, pagid Racing, or Ferodo Racing ranges may be considered after verifying the appropriate part number.

For intensive use, we recommend compatible aviation-grade hoses and a high-performance brake fluid that meets the vehicle’s specifications, along with proper bleeding and fluid replacement. This recommendation complements mounting that is compatible with the original hydraulic system.

Maintenance of the Girodisc mounting on compatible vehicles

Replacing the pads alone helps keep the rotors in good condition. Reusing a rotor for up to three pad replacements is subject to inspection of its condition, its mounting components, and the mounting instructions; this number does not constitute a guaranteed service life. Use a new mounting component each time you replace the pads.

FAQ — Girodisc A1-174 for Compatible Vehicles

What are the sizes of the A1-174 discs for my vehicle? The part number shown measures 380 × 33 mm and is mounted on the front axle. The diameter alone is not sufficient: also check the brake system type and mounting requirements.

Is the product sold in pairs? Yes. It includes a left and a right disc for the same axle. Both discs come with their disc bells.

Do I need to replace my vehicle’s brake pads?Yes. Always install new brake pads with new rotors or new braking surfaces. Use a compound suitable for cast iron and your intended use. D1405-shaped front brake pads are required for both cast-iron and carbon-ceramic brake disk versions.

How do I identify the left and right sides? Girodisc rotors come with a label attached to each rotor: LEFT for the left side and RIGHT for the right side, as viewed from the direction of travel. On a left-hand-drive vehicle, “LEFT” corresponds to the driver’s side and “RIGHT” to the passenger side. Follow these labels and the instructions. On models with curved internal fins, the rolling direction depends on this internal ventilation; the surface grooves alone are not sufficient to determine the side.

How do I break in this mounting on my vehicle? Follow the Girodisc procedure and the brake pad manufacturer’s instructions to build up an even transfer ply. The PDF documents below detail installation and break-in.

PDF Documents for Mounting and Break-in

We have included two PDF documents below: an instruction manual for installing and breaking in the discs, and an instruction manual for installing new tracks on existing bowls. Consult the document that applies to your specific task before you begin.

Key Features of Girodisc A1-174 Bowl Brake Discs

• 380 × 33 mm size for front braking on compatible vehicles.
• 6061-T6 aluminum rotor and floating mount to manage thermal stresses.
• Replaceable pads to maintain a two-piece mounting.
• Left/right pair identified for mounting.
• Aluminum rotors to minimize the unsprung mass and rotating mass of the conversion kit.