Dodge Viper ACR Front Iron Rotor Conversion (Girodisc A1-165)
The Girodisc Front Iron Rotor Conversion for the Dodge Viper ACR provides a high-performance, serviceable alternative to the factory carbon-ceramic rotors. Designed as a direct bolt-on replacement, this system maintains OEM caliper compatibility and factory brake balance while improving heat tolerance, reducing maintenance costs, and offering long-term durability.
Vehicle Fitment
This Girodisc front rotor conversion kit fits the following models:
- Dodge Viper ACR (2015–2017)
- Dodge Viper TA and GTS models equipped with OEM carbon-ceramic front rotors
Designed for factory calipers and hubs with no modifications required.
Performance and Design
To maintain optimal weight and performance, the Girodisc system uses a pad annulus (swept area) of 66mm or less, requiring the use of brake pads with the FMSI #1405 pad shape. This ensures ideal mass and thermal characteristics without adding unnecessary weight. The two-piece floating rotor design features a lightweight 6061-T6 aluminum hat and a proprietary cast iron rotor ring, both machined in the USA for superior precision and performance. The curved vane internal structure acts as a centrifugal pump, forcing cooling air through the disc to minimize fade during sustained high-speed braking.
Features
- Direct replacement for OEM carbon-ceramic rotors; bolts on with no modifications.
- Requires FMSI #1405 pad shape (available in multiple compounds).
- Two-piece floating design with a 6061-T6 aluminum hat and proprietary cast iron friction ring.
- Curved vane internal design increases airflow for exceptional heat dissipation and stability.
- Floating mount system with 12 high-strength alloy steel drive pins for controlled axial and radial float.
- Anti-noise spring washers eliminate rattle while allowing full thermal expansion of the rotor under load.
- Cadmium-plated hardware and class 12.9 cap screws ensure long-term corrosion resistance.
- Fully machined and assembled in the USA to Girodisc motorsport standards.
Specifications
Rotor Type: Two-piece floating iron rotor conversion
Pad Shape: FMSI #1405 (annulus ≤ 66mm)
Material: Proprietary cast iron with 6061-T6 aluminum hat
Hardware: 12 alloy steel drive pins with anti-noise spring washers
Fitment: Dodge Viper ACR, TA, and GTS with OEM CCM rotors
Installation: Direct bolt-on
Sold as: Pair (left and right front rotors)
FAQs: Dodge Viper ACR Front Iron Rotor Conversion (Girodisc)
Why is a different pad shape required? To maintain ideal mass and temperature control, these rotors use a 66mm swept area. The correct pad shape is FMSI #1405, which Girodisc offers in several compounds.
Can I use my stock carbon-ceramic pads? No. The OEM CCM pad annulus is too large for this conversion. Use only the specified FMSI #1405 pad shape.
Are these rotors quieter than typical race-style floating rotors? Yes. The floating pins are mounted with anti-noise spring washers that eliminate rattle during street use while maintaining full float under heavy braking.
What are the main advantages of switching to iron rotors? Improved thermal durability, easier serviceability, and significantly lower replacement costs compared to carbon-ceramic rotors.
Can I reuse the aluminum hats when replacing the rings? Yes. Only the cast iron friction rings need to be replaced once worn, allowing cost-effective maintenance.
Ordering Information
Sold and priced per pair. Includes left and right Girodisc front iron rotors for Dodge Viper ACR, TA, and GTS models with carbon-ceramic front brakes. Requires FMSI #1405 pad shape for installation.
