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

The GiroDisc Porsche 991 GT3 rear rotors are a direct OE replacement for the 991 Porsche 911 GT3 and GT3 RS equipped with OEM iron rotors. They bolt directly to the car and work with the OE calipers with no modifications necessary.

Do the GiroDisc Porsche 991 GT3 rear rotors use factory pads?

Yes. Unlike most aftermarket solutions for this application, the GiroDisc Porsche 991 GT3 rear rotors allow the use of unmodified factory pads. They bolt directly to the car and work with the OE calipers.

Do the GiroDisc Porsche 991 GT3 rear rotors fit cars with PCCB carbon ceramic brakes?

No. These are for the 991 GT3 and GT3 RS with OEM iron rotors. If your car has factory PCCB carbon ceramic brakes, use the GiroDisc PCCB rear iron rotor conversion (A2-154) instead.

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.

What happens when the GiroDisc Porsche 991 GT3 rear rotor rings wear out?

Only the cast iron ring is replaced, not the full assembly. The aluminum hat is reused, making ongoing maintenance more cost-effective than replacing complete one-piece rotors.

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Description

GiroDisc Rear Slotted Rotors 911 GT3 / GT3 RS (excl PCCB)

Porsche 991 GT3 rear rotors from GiroDisc are a 2-piece, fully floating direct OE replacement for the rear disc on the 991 Porsche 911 GT3 and GT3 RS with OEM iron rotors, with no modifications necessary. The GiroDisc Porsche 991 GT3 rear rotors bolt directly to the car and work with the OE calipers, and they allow the use of unmodified factory pads unlike most aftermarket solutions for this application. Upgrading with lightweight high-performance rotors rather than a big brake kit maintains the factory brake bias and ABS efficiency while cutting rotational and unsprung weight. Sold and priced per pair.

Why the GiroDisc Porsche 991 GT3 Rear Rotors?

The GiroDisc Porsche 991 GT3 rear rotors bolt straight on with no modifications and allow the use of unmodified factory pads, unlike most aftermarket solutions for this application, while maintaining the factory brake bias and ABS efficiency. 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 Fit with Factory Pads

The GiroDisc Porsche 991 GT3 rear rotors are a direct replacement for the OE disc on the 991 GT3 and GT3 RS equipped with OEM iron rotors. No modifications are necessary; they bolt directly to the car, work with the OE calipers, and allow the use of unmodified factory pads, so there is no change to your caliper or pad selection while you gain the benefits of a 2-piece floating rotor.

Floating Mount and Construction

The rotor and hat of the GiroDisc Porsche 991 GT3 rear rotors use a floating mount system with 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, lowering the long-term cost of maintaining the brakes compared with replacing complete one-piece rotors.

Features

2-piece, fully floating rear rotor assembly
Direct OE replacement for the 991 GT3 and GT3 RS with OEM iron rotors
Bolts on with no modifications; works with the OE calipers
Allows the use of unmodified factory pads
Maintains factory brake bias and ABS efficiency
Proprietary GiroDisc cast iron disc, poured and machined in-house in the USA
Curved vane design acts as a centrifugal pump for active cooling
Cadmium-plated high-strength alloy steel drive pins
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 (OEM iron rotors, excl. PCCB)
Porsche 911 GT3 RS: 991 | 2016-2019 (OEM iron rotors, excl. PCCB)

Notes

Sold and priced per pair (one set of rear rotors)
For the 991 GT3 and GT3 RS with OEM iron rotors. Bolts on with no modifications, works with the factory calipers, and allows the use of unmodified factory pads.
If your car has factory PCCB carbon ceramic brakes, this is not the correct part; use the GiroDisc 991 / 992 GT3 / GT2 RS / GT4 RS PCCB rear iron rotor conversion (A2-154) instead.
This is the complete 2-piece rotor assembly. 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

Which cars do the GiroDisc Porsche 991 GT3 rear rotors fit? The GiroDisc Porsche 991 GT3 rear rotors are a direct OE replacement for the 991 Porsche 911 GT3 and GT3 RS equipped with OEM iron rotors. They bolt directly to the car and work with the OE calipers with no modifications necessary.
Do the GiroDisc Porsche 991 GT3 rear rotors use factory pads? Yes. Unlike most aftermarket solutions for this application, the GiroDisc Porsche 991 GT3 rear rotors allow the use of unmodified factory pads. They bolt directly to the car and work with the OE calipers.
Do the GiroDisc Porsche 991 GT3 rear rotors fit cars with PCCB carbon ceramic brakes? No. These are for the 991 GT3 and GT3 RS with OEM iron rotors. If your car has factory PCCB carbon ceramic brakes, use the GiroDisc PCCB rear iron rotor conversion (A2-154) instead.
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.
What happens when the GiroDisc Porsche 991 GT3 rear rotor rings wear out? Only the cast iron ring is replaced, not the full assembly. The aluminum hat is reused, making ongoing maintenance more cost-effective than replacing complete one-piece rotors.

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 Slotted Rotors 911 GT3 / GT3 RS (excl PCCB) [A2-146]

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GiroDisc Rear Slotted Rotors 911 GT3 / GT3 RS (excl PCCB)

Why the GiroDisc Porsche 991 GT3 Rear Rotors?

Direct Fit with Factory Pads

Floating Mount and Construction

A Reusable Two-Piece Design

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews