Which car do the GiroDisc Porsche 991 GT3 Cup rear rotors fit?

The GiroDisc Porsche 991 GT3 Cup rear rotors (380x30) are a direct replacement for the OE disc on the 991 Porsche 911 GT3 Cup race car. They bolt directly to the car and work with the OE calipers.

Do I need the centerlock drive-pin option for the GiroDisc Porsche 991 GT3 Cup rear rotors?

If your car came with OEM centerlock wheels, yes, select the centerlock drive-pin option when ordering. Cars without centerlock wheels use the standard drive-pin configuration.

What size are the GiroDisc Porsche 991 GT3 Cup rear rotors?

The GiroDisc Porsche 991 GT3 Cup rear rotors are 380mm in diameter and 30mm thick (380x30). The matching front rotors for the Cup car are a different size (380x32, A1-238).

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

The GiroDisc Porsche 991 GT3 Cup 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 Cup rear rotor rings wear out?

Only the cast iron ring is replaced, not the full assembly. Replacement rings (D2-238) attach to the reusable aluminum hat, making ongoing maintenance more cost-effective than replacing complete one-piece rotors.

Description

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Description

GiroDisc Rear 380x30mm Rotors for 991 Porsche 911 GT3 Cup

Porsche 991 GT3 Cup rear rotors from GiroDisc are 2-piece, fully floating 380×30 rear rotors a direct replacement for the OE Cup car disc. These GiroDisc Porsche 991 GT3 Cup rear rotors bolt directly to the car and work with the OE calipers 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. When used with performance pads and high-temperature fluid, they amount to a truly effective solution to overheating or warping rotors. Sold and priced per pair.

Why the GiroDisc Porsche 991 GT3 Cup Rear Rotors?

The GiroDisc Porsche 991 GT3 Cup rear rotors are a direct replacement for the OE Cup car disc that bolts on and works with the OE calipers, and when used with performance pads and high-temperature fluid they are a truly effective solution to overheating or warping rotors. 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.

Centerlock Drive-Pin Option

If your car came with OEM centerlock wheels, select the centerlock drive-pin option when ordering your GiroDisc Porsche 991 GT3 Cup rear rotors. This ensures the correct drive-pin configuration for centerlock-equipped cars; standard cars use the standard drive-pin setup.

Floating Mount and Construction

The rotor and hat of the GiroDisc Porsche 991 GT3 Cup 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 Cup 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. Replacement rings are available separately (D2-238).

Features

2-piece, fully floating rear rotor assembly, 380×30
Direct replacement for the OE Cup car disc
Works with the OE calipers
Centerlock drive-pin option for OEM centerlock-equipped cars
Effective solution to overheating and warping with performance pads and hi-temp fluid
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 (D2-238)

Applications

Porsche 911 GT3 Cup: 991 | 2013-2020 (cup race car)

Notes

Sold and priced per pair (one set of rear rotors)
If your car came with OEM centerlock wheels, select the centerlock drive-pin option when ordering
For best results, use with performance pads and high-temperature brake fluid
This is the complete 2-piece rotor assembly. When the rings wear, replacement rings (D2-238) reuse your existing GiroDisc hats and fit GiroDisc hats only, not OEM or other-brand hats.
Stock photography may not depict the actual product.

Frequently Asked Questions

Which car do the GiroDisc Porsche 991 GT3 Cup rear rotors fit? The GiroDisc Porsche 991 GT3 Cup rear rotors (380×30) are a direct replacement for the OE disc on the 991 Porsche 911 GT3 Cup race car. They bolt directly to the car and work with the OE calipers.
Do I need the centerlock drive-pin option for the GiroDisc Porsche 991 GT3 Cup rear rotors? If your car came with OEM centerlock wheels, yes, select the centerlock drive-pin option when ordering. Cars without centerlock wheels use the standard drive-pin configuration.
What size are the GiroDisc Porsche 991 GT3 Cup rear rotors? The GiroDisc Porsche 991 GT3 Cup rear rotors are 380mm in diameter and 30mm thick (380×30). The matching front rotors for the Cup car are a different size (380×32, A1-238).
What are the GiroDisc Porsche 991 GT3 Cup rear rotors made of? The GiroDisc Porsche 991 GT3 Cup 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 Cup rear rotor rings wear out? Only the cast iron ring is replaced, not the full assembly. Replacement rings (D2-238) attach to the reusable aluminum hat, 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 380x30mm Rotors for 991 Porsche 911 GT3 Cup [A2-238]

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GiroDisc Rear 380x30mm Rotors for 991 Porsche 911 GT3 Cup

Why the GiroDisc Porsche 991 GT3 Cup Rear Rotors?

Centerlock Drive-Pin Option

Floating Mount and Construction

A Reusable Two-Piece Design

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews