What is the difference between A1-306 and A1-272 Porsche 992 GT3 front rotors?

The GiroDisc Porsche 992 GT3 front rotors A1-306 are the 36mm hat specification; A1-272 is the standard hat specification. Both are 408mm diameter. The correct version depends on your specific car's hat depth — measure or confirm with GiroDisc before ordering to ensure the correct fitment.

Do the GiroDisc Porsche 992 GT3 front rotors fit the GT3 RS?

Yes. The A1-306 GiroDisc Porsche 992 GT3 front rotors are confirmed fitment for both the 992 GT3 and GT3 RS in the 36mm hat specification.

What are the benefits of 2-piece Porsche 992 GT3 front rotors over OEM single-piece?

The GiroDisc Porsche 992 GT3 front rotors reduce unsprung weight and rotating mass versus a cast single-piece rotor, improving front axle response. The fully floating iron ring also expands thermally without distorting the aluminum hat, maintaining dimensional stability and consistent pedal feel under repeated hard stops — a key advantage on a track-day car like the 992 GT3.

What makes GiroDisc Porsche 992 GT3 front rotors better than standard iron rotors?

GiroDisc's Porsche 992 GT3 front rotors use rings machined from a proprietary high-carbon iron casting to GiroDisc's own metallurgical specification. The 72 curved vanes act as a centrifugal pump pulling air through the hub for active cooling — more effective than standard vane designs under the sustained high-temperature braking the GT3 generates on track.

Is there a matching rear rotor for the Porsche 992 GT3?

Yes. The GiroDisc Porsche 992 GT3 and GT4 RS rear rotors (A2-272) are available separately and recommended for a matched front-to-rear upgrade with consistent weight reduction and thermal behavior across both axles.

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Description

GiroDisc Front 36mm Rotors for 992 Porsche 911 GT3 and GT3 RS

Porsche 992 GT3 front rotors from GiroDisc in the 36mm hat specification are a 2-piece, fully floating direct replacement for the front brake rotors on the 992 GT3 and GT3 RS, engineered to reduce unsprung weight and rotating mass at the front axle while delivering consistent, high-performance braking on road and track. The GiroDisc Porsche 992 GT3 front rotors (A1-306) are the 36mm hat version. Confirm your fitment before ordering, as the standard 992 GT3 also uses A1-272 (standard hat). All major components are manufactured in-house at GiroDisc’s facility in Bellingham, WA, from domestically sourced materials.

Why Upgrade to GiroDisc Porsche 992 GT3 Front Rotors?

The GiroDisc Porsche 992 GT3 front rotors are machined from a proprietary high-carbon iron casting formulated to GiroDisc’s own metallurgical specification, not an off-the-shelf iron casting, resulting in a rotor that sustains consistent friction characteristics and holds up better under sustained hard use than standard iron alternatives. The 72 curved vanes act as a centrifugal pump, pulling air in through the hub and pushing it radially outward through the rotor for active cooling under hard braking, critical on a track-day car like the 992 GT3 where sustained high-speed braking zones generate significant heat. The 2-piece fully floating design allows the iron ring to expand thermally without distorting the aluminum hat, maintaining dimensional stability and consistent pedal feel across repeated hard stops. When the rings wear to a minimum thickness, only the rings need replacing, not the entire assembly, keeping long-term running costs well below replacing full single-piece rotors.

Porsche 992 GT3 Front Rotors: Construction and Materials

The GiroDisc Porsche 992 GT3 front rotors are built around a high-carbon iron ring machined from GiroDisc’s proprietary casting, attached to a 6061-T6 aluminum hat finished in black anodize. Drive pins are made from a high-strength steel alloy and cadmium-plated for long-term corrosion resistance. All rotors are assembled with spring clips and Belleville washers for race-ready float — maintaining the fully floating characteristic under temperature without the rattles and noise that poorly assembled 2-piece rotors can produce on the street. All major components including hats, rings, and drive pins are manufactured in-house at GiroDisc’s Bellingham, WA facility from US-sourced materials.

Features

2-piece fully floating front rotor in 36mm hat specification for 992 GT3 and GT3 RS
Reduces unsprung weight and rotating mass at the front axle
Proprietary high-carbon iron rings Superior metallurgy for durability and fade resistance
72 curved vanes acting as a centrifugal pump for active hub-to-rotor cooling
Reusable 6061-T6 aluminum hat black anodized finish
High-strength steel alloy drive pins cadmium-plated for corrosion resistance
Spring clips and Belleville washers for race-ready float, street-friendly operation
All major components manufactured in-house in Bellingham, WA from US-sourced materials

Applications

Porsche 911 GT3: 992 | 2022-present
Porsche 911 GT3 RS: 992 | 2023-present

Notes

Sold and priced per pair
36mm hat specification confirm your fitment before ordering. Standard 992 GT3 may use A1-272 (standard hat) instead.
Matching rear rotors available: A2-272 (992 GT3 / GT4 RS rear)
Here’s the PCCB iron rotor conversion
Stock photography may not depict actual product

Frequently Asked Questions

What is the difference between A1-306 and A1-272 Porsche 992 GT3 front rotors? The GiroDisc Porsche 992 GT3 front rotors A1-306 are the 36mm hat specification; A1-272 is the standard hat specification. Both are 408mm diameter. The correct version depends on your specific car’s hat depth measure or confirm with GiroDisc before ordering to ensure the correct fitment.
Do the GiroDisc Porsche 992 GT3 front rotors fit the GT3 RS? Yes. The A1-306 GiroDisc Porsche 992 GT3 front rotors are confirmed fitment for both the 992 GT3 and GT3 RS in the 36mm hat specification.
What are the benefits of 2-piece Porsche 992 GT3 front rotors over OEM single-piece? The GiroDisc Porsche 992 GT3 front rotors reduce unsprung weight and rotating mass versus a cast single-piece rotor, improving front axle response. The fully floating iron ring also expands thermally without distorting the aluminum hat, maintaining dimensional stability and consistent pedal feel under repeated hard stops a key advantage on a track-day car like the 992 GT3.
What makes GiroDisc Porsche 992 GT3 front rotors better than standard iron rotors? GiroDisc’s Porsche 992 GT3 front rotors use rings machined from a proprietary high-carbon iron casting to GiroDisc’s own metallurgical specification. The 72 curved vanes act as a centrifugal pump pulling air through the hub for active cooling more effective than standard vane designs under the sustained high-temperature braking the GT3 generates on track.
Is there a matching rear rotor for the Porsche 992 GT3? Yes. The GiroDisc Porsche 992 GT3 and GT4 RS rear rotors (A2-272) are available separately and recommended for a matched front-to-rear upgrade with consistent weight reduction and thermal behavior across both axles.

About GiroDisc

Founded in 2003, GiroDisc set out to revolutionize performance braking by designing and manufacturing two-piece brake rotors engineered to perform flawlessly under extreme conditions. Traditional one-piece rotors are heavy, retain heat, and increase unsprung weight, which hurts handling; GiroDisc’s fully floating design uses tension hardware for silent street operation while delivering track-ready performance. By focusing exclusively on this specialized niche, GiroDisc has advanced its engineering and manufacturing to industry-leading standards, letting enthusiasts upgrade their existing brake systems without the expense and complexity of a big brake kit. Based in Bellingham, Washington, GiroDisc handles every aspect of production on site, from design and engineering to manufacturing and fulfillment.

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 Front 36mm Rotors for 992 Porsche 911 GT3 and GT3 RS [A1-306]

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GiroDisc Front 36mm Rotors for 992 Porsche 911 GT3 and GT3 RS

Why Upgrade to GiroDisc Porsche 992 GT3 Front Rotors?

Porsche 992 GT3 Front Rotors: Construction and Materials

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews