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A2154 Girodisc 991 GT3 (w PCCB) Rear Two-Piece Floating Rotor Conversion

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This 390mm Girodisc conversion system is a rear rotor replacement for GT3s and RSs originally equipped with PCCB brakes. The two-piece steel rotor and aluminum hat combination is a direct replacement for the PCCB rotors. These two-piece floating rotors will bolt directly to the car and work with OEM calipers perfectly.

By upgrading your brakes with these lightweight, high-performance Girodisc rotors (paired with the A1154 front rotors), your factory brake bias and ABS efficiency are maintained. The low rotational and unsprung weight allows for quicker acceleration and transient suspension response. Most racers replace the factory PCCBs with steel two-piece rotors to avoid the inevitable damage to the fragile carbon ceramic discs when swapping wheels at the track!

When used with Pagid or PFC performance brake pads and CMS RF1 Racing brake fluid, you have an amazing, durable solution to cracked or broken carbon-ceramic rotors at a fraction of the cost of replacing the factory PCCB units.

The central hat section of each disc is made from 6061-T6 aircraft aluminum. The disc is manufactured from cast iron which is constructed in the USA and is made to the same specification with the same material used by professional racing organizations. The rotors curved-vane design was developed in racing and acts as a centrifugal pump to force cooling air through the disc.  

The rotor and hat mount together through a floating mount system which utilizes eight to ten high-strength alloy steel drive pins manufactured by Girodisc in the USA to their own specifications and are cadmium plated for corrosion resistance. These alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat.  The pins are secured by Grade 12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors.

The two-piece Girodisc design allows for rotor only replacement as well to minimize future replacement costs and deliver outstanding performance and cooling.

Competition Motorsport is an Authorized dealer for Girodisc products and one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline.

You must use must use the pad shape used on the 991 GT3 with the iron rotors. The annulus (pad swept height) of these rotors is smaller than the PCCB pads to keep the rotor weight low and allow for far better pad selection.

Sold/priced per pair.