Viper ACR Steel Brake Rotor Conversion

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  • Regular price $1,400.00


The Girodisc system is a direct replacement for the OE carbon ceramic disc however a different brake pad with an annulus (pad swept area) of 66mm or less must be used. This is done to keep the rotor weight at a reasonable level. A rotor with the same annulus as the OEM CCM rotors they would be unnecessarily heavy. The necessary pad shape is FMSI 1405 which can be provided in several compounds.

The central hat section of the Girodisc rotor is made from U.S. sourced 6061-T6 aircraft specification aluminum. The disc is made from proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc.

The rotor and hat have a floating mount system, which utilizes 12 high strength alloy steel drive pins, manufactured by Girodisc in the USA and cadmium plated for a long lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The pins are secured by class 12.9 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self center between the pads.

Once the Girodisc system is in place, simply replace the cast iron rotor when needed.

2003-2017 Viper (Excludes GEN5 ACR)
- Upgrade for GEN1 & GEN2 Viper running SRT Calipers with 14" adapters.

Sold/priced per pair.