Do the GiroDisc Porsche 991 GT3 rear rotors need special pads?

No. Unlike the front conversion, the rear rotors are a direct replacement for the OEM PCCB disc that works with the OEM calipers and pads with no modifications necessary.

Which models do the GiroDisc Porsche 991 GT3 rear rotors fit?

The GiroDisc Porsche 991 GT3 rear rotors fit the 991 and 992 GT3 and GT2 RS and the 718 GT4 RS, in each case where the car is equipped with factory PCCB carbon ceramic rear brakes. Confirm your car has PCCB before ordering.

Why convert from PCCB carbon ceramic to the GiroDisc Porsche 991 GT3 rear rotors?

The GiroDisc Porsche 991 GT3 rear rotors move you to a serviceable 2-piece iron rotor that is far more cost-effective than replacing factory carbon ceramic rotors, especially for track use. When the rings wear you replace only the cast iron ring and reuse the aluminum hat.

What are the GiroDisc Porsche 991 GT3 rear rotors made of?

The GiroDisc Porsche 991 GT3 rear rotors use a disc of GiroDisc's proprietary cast iron, poured in the USA and machined in-house, with a U.S.-sourced 6061-T6 aircraft-specification aluminum hat and a curved vane design that forces cooling air through the disc.

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Description

GiroDisc Rear Iron Rotor Conversion for 991 and 992 Porsche 911 GT3 / GT2 RS / 718 GT4 RS (w/ PCCB)

Porsche 991 GT3 rear rotors from GiroDisc are a 2-piece, fully floating iron rotor conversion that directly replaces the factory PCCB carbon ceramic rear discs on the 991 and 992 Porsche 911 GT3 and GT2 RS and the 718 GT4 RS. These GiroDisc Porsche 991 GT3 rear rotors are a direct replacement iron rotor for the OEM PCCB disc with no modifications necessary; they bolt directly to the car and work with the OEM calipers and pads perfectly. The disc is made from GiroDisc’s proprietary cast iron, poured in the USA and machined start to finish in-house, with a curved vane design developed in racing to force cooling air through the disc. Sold and priced per pair.

Why the GiroDisc Porsche 991 GT3 Rear Rotors?

The GiroDisc Porsche 991 GT3 rear rotors let owners of PCCB carbon-ceramic-equipped cars switch to a 2-piece iron rotor that is far more cost-effective to maintain, especially for track use where carbon ceramic replacement is prohibitively expensive. The central hat is machined from strictly U.S.-sourced 6061-T6 aircraft-specification aluminum, while the disc is GiroDisc’s proprietary cast iron, poured in the USA and machined start to finish in-house. The curved vane design, developed in racing, acts as a centrifugal pump to force cooling air through the disc under hard use.

Direct PCCB Replacement, Works with OEM Pads

The GiroDisc Porsche 991 GT3 rear rotors are a direct replacement iron rotor for the OEM PCCB disc with no modifications necessary. Unlike the front conversion, the rear bolts directly to the car and works with the OEM calipers and pads perfectly, so there is no change to your caliper or pad selection when converting the rear from carbon ceramic to iron.

Floating Mount and Construction

The rotor and hat of the GiroDisc Porsche 991 GT3 rear rotors use a floating mount system with 12 high-strength alloy steel drive pins, manufactured by GiroDisc in the USA and cadmium-plated for long-lasting corrosion resistance. These pins take the braking load while maintaining axial and radial float between the hat and disc, secured by class 12.9 cap screws with hardened washers. Anti-noise spring washers on the rotor side let the rotor grow with heat expansion while eliminating the rattle associated with floating rotors, and the float lets the rotor self-center between the pads.

A Reusable Two-Piece Design

Once the GiroDisc Porsche 991 GT3 rear rotor system is in place, you simply replace the cast iron rotor ring when needed while reusing the aluminum hat, keeping long-term cost well below factory carbon ceramic replacement.

Features

2-piece, fully floating rear iron rotor conversion
Direct replacement for the OEM PCCB carbon ceramic rear disc
Fits 991 and 992 GT3, GT2 RS, and 718 GT4 RS with PCCB
Works with the OEM calipers and pads, no modifications
Proprietary GiroDisc cast iron disc, poured and machined in-house in the USA
Curved vane design acts as a centrifugal pump for active cooling
Floating mount with 12 high-strength alloy steel drive pins, cadmium-plated
Class 12.9 cap screws with hardened washers
Anti-noise spring washers eliminate rattle; rotor self-centers between pads
U.S.-sourced 6061-T6 aircraft-specification aluminum hat
Reusable hat; replace only the cast iron ring when worn

Applications

Porsche 911 GT3: 991 | 2014-2019 (with PCCB)
Porsche 911 GT3: 992 | 2021-present (with PCCB)
Porsche 911 GT2 RS: 991 | 2018-2019 (with PCCB)
Porsche 718 Cayman GT4 RS: 982 | 2022-present (with PCCB)

Notes

Sold and priced per pair (one set of rear rotors)
Direct replacement iron rotor for the OEM PCCB rear disc. No modifications necessary; works with the OEM calipers and pads. Confirm your car has PCCB carbon ceramic rear brakes before ordering.
This is the rear conversion. The matching front conversion (A1-154 for 991, A1-276 for 992) requires the 991 GT3 iron-rotor pad shape; the rear works with OEM pads.
This is the complete iron rotor conversion. When the rings wear, only the cast iron ring is replaced while the aluminum hat is reused.
Stock photography may not depict the actual product.

Frequently Asked Questions

What do the GiroDisc Porsche 991 GT3 rear rotors replace? The GiroDisc Porsche 991 GT3 rear rotors are a 2-piece iron conversion that directly replaces the factory PCCB carbon ceramic rear discs on the 991 and 992 GT3 and GT2 RS and the 718 GT4 RS, moving you to a serviceable, cost-effective iron rotor.
Do the GiroDisc Porsche 991 GT3 rear rotors need special pads? No. Unlike the front conversion, the rear rotors are a direct replacement for the OEM PCCB disc that works with the OEM calipers and pads with no modifications necessary.
Which models do the GiroDisc Porsche 991 GT3 rear rotors fit? The GiroDisc Porsche 991 GT3 rear rotors fit the 991 and 992 GT3 and GT2 RS and the 718 GT4 RS, in each case where the car is equipped with factory PCCB carbon ceramic rear brakes. Confirm your car has PCCB before ordering.
Why convert from PCCB carbon ceramic to the GiroDisc Porsche 991 GT3 rear rotors? The GiroDisc Porsche 991 GT3 rear rotors move you to a serviceable 2-piece iron rotor that is far more cost-effective than replacing factory carbon ceramic rotors, especially for track use. When the rings wear you replace only the cast iron ring and reuse the aluminum hat.
What are the GiroDisc Porsche 991 GT3 rear rotors made of? The GiroDisc Porsche 991 GT3 rear rotors use a disc of GiroDisc’s proprietary cast iron, poured in the USA and machined in-house, with a U.S.-sourced 6061-T6 aircraft-specification aluminum hat and a curved vane design that forces cooling air through the disc.

About GiroDisc

GiroDisc designs, manufactures, and sells 2-piece, fully floating brake rotors for a wide range of performance vehicles. Every major component, including the hats, rotor rings, and drive pins, is manufactured in-house at their facility in Bellingham, Washington, from domestically sourced materials. GiroDisc rotors use a proprietary cast iron ring formulated for superior metallurgy and thermal performance, paired with reusable machined-aluminum hats that reduce the long-term cost of maintaining a high-performance brake system. The 2-piece floating design sheds unsprung and rotating mass while remaining street-friendly, delivering race-proven braking for track and street use alike.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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GiroDisc Rear Iron Rotor Conversion for 991 and 992 Porsche 911 GT3 / GT2 RS / 718 GT4 RS (w/ PCCB) [A2-154]

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GiroDisc Rear Iron Rotor Conversion for 991 and 992 Porsche 911 GT3 / GT2 RS / 718 GT4 RS (w/ PCCB)

Why the GiroDisc Porsche 991 GT3 Rear Rotors?

Direct PCCB Replacement, Works with OEM Pads

Floating Mount and Construction

A Reusable Two-Piece Design

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews