Acura NSX Front Rotors (Girodisc) – A1-174
Girodisc two-piece front rotors for the Acura NSX are a direct bolt-on upgrade that reduce unsprung and rotating mass, sharpen response, and improve cooling while maintaining factory brake bias and ABS performance. These rotors are compatible with cars originally equipped with iron or carbon-ceramic front rotors; note the pad shape requirement below.
Pad shape note for carbon-ceramic cars
For vehicles originally fitted with carbon-ceramic front rotors, you must switch to the D1405 front pad shape to use these rotors. Contact us if you need help selecting compatible pads.
Features of Girodisc A1-174
Direct replacement for the OE front discs; no permanent modifications required.
Two-piece construction with a US-sourced 6061-T6 aluminum hat and proprietary cast-iron disc for high thermal stability.
Curved-vane internal design acts as a centrifugal pump to move cooling air through the rotor at speed.
Floating mount system uses high-strength alloy steel drive pins with spring washers to allow controlled float, reduce noise when cold, and let the disc expand evenly under heat.
Lower rotating and unsprung mass improves acceleration, steering feel, and suspension response.
Factory brake bias and ABS calibration are preserved.
Service-friendly design lets you replace only the iron rings when worn.
What’s included
One left and one right front rotor (sold and priced as a pair).
FAQs: Acura NSX Front Rotors (Girodisc A1-174)
Do these fit NSX models with carbon-ceramic front brakes?
Yes. They fit both iron and carbon-ceramic applications, but carbon-ceramic cars must switch to the D1405 pad shape on the front calipers.
Are any caliper spacers or brackets required?
No spacers or brackets are required for installation with the factory calipers.
Will these change pedal feel or ABS behavior?
No. Rotor dimensions and effective radius are engineered to maintain factory bias and ABS operation while improving thermal capacity and weight.
Are they noisy like some floating race rotors?
The floating system uses spring washers to minimize rattle at low temperatures while still allowing thermal growth under heavy use.
How do I service them later?
When the friction rings wear out, you can replace just the iron rings and reuse the aluminum hats and hardware per manufacturer guidelines.
Fitment and ordering
Acura NSX front axle. Verify pad shape if converting from carbon-ceramic (use D1405 in front). Sold as a matched left and right pair under SKU A1-174.
