Which cars take the GiroDisc 380mm Rear Rotors for 991 Turbo models?

The GiroDisc 380mm Rear Rotors for 991 Porsche 911 Turbo and Turbo S cars replace the 380mm factory iron rear discs. GiroDisc describes the part as fitting a variety of Porsche applications with that rear disc, so confirm the original size before ordering.

What are the key dimensions of this rear rotor?

GiroDisc lists 380mm outer diameter, 32mm thickness, a 30mm minimum thickness and 72 curved vanes. Each complete assembly weighs 23.1 lb, including the black anodized aluminum hat and the floating hardware that holds the ring. The slotted face keeps the friction surface clean.

Which rings replace the iron on these hats?

GiroDisc specifies D2-146 as the replacement ring for this rotor. The rings come in pairs with new mounting hardware and bolt to the existing hats, so the aluminum is bought once and only the iron is renewed afterward. Both sides ship together.

Is a 991 Turbo with ceramic brakes covered?

No. This rotor replaces the factory 380mm iron rear disc. A car with Porsche Ceramic Composite Brakes uses different discs and calipers and would need a separate GiroDisc conversion part instead of this rotor. Ask Bulletproof Automotive which part suits that car.

Why are the rotors marked left and right?

The 72 vanes are curved and only pump air outward when they sweep with the rotation of the wheel. GiroDisc labels each rotor for its side, and fitting one on the wrong corner sacrifices much of its cooling capacity. Follow the labels.

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Description

GiroDisc 380mm Rear Rotors for 991 Porsche 911 Turbo

GiroDisc’s 380mm Rear Rotors for 991 Porsche 911 Turbo and Turbo S models on iron brakes replace the factory rear discs with a 380mm by 32mm two-piece floating assembly weighing 23.1 lb. The ring runs 72 curved vanes and rides on a black anodized 6061-T6 hat. A 991 Turbo puts enormous speed into its brakes, and owners who take theirs to the track will value a rear disc that cools well and renews with rings alone.

Design and Performance

GiroDisc builds this rotor as a direct replacement for 380mm Porsche rear discs, so the factory calipers refit unchanged. The ring floats on cadmium-plated alloy steel drive pins, letting it grow with heat without loading the hat, and anti-noise spring washers keep it quiet when cold. Worn rings are swapped for D2-146 rings at the 30mm limit.

Features

380mm outer diameter and 32mm thickness
72 curved vanes per ring
23.1 lb per complete assembly, by GiroDisc measurement
Black anodized 6061-T6 aluminum hat
Fully floating ring on alloy steel drive pins
Iron poured in the USA and machined in Bellingham, Washington

Specifications

Outer diameter: 380mm
Thickness: 32mm
Minimum thickness: 30mm
Weight: 23.1 lb per rotor assembly
Vane count: 72 curved vanes
Replacement rings: D2-146

What’s Included

Rear rotor assemblies (L/R)

Applications

Porsche 911 Turbo: 991 | with iron brakes | 3.8L twin-turbo flat-six
Porsche 911 Turbo S: 991 | with iron brakes | 3.8L twin-turbo flat-six

Notes

The GiroDisc 380mm Rear Rotors for 991 Turbo models replace 380mm iron rear discs; cars with PCCB are not covered
GiroDisc lists this rotor for several Porsche applications with 380mm rear discs, so confirm the factory size before ordering
Worn rings are renewed with the GiroDisc Porsche 380mm rear replacement rings on these hats
Cap screws are never tightened beyond 60 in-lb (7 Nm)
Stock photography may not depict the actual product

Frequently Asked Questions

Which cars take the GiroDisc 380mm Rear Rotors for 991 Turbo models? The GiroDisc 380mm Rear Rotors for 991 Porsche 911 Turbo and Turbo S cars replace the 380mm factory iron rear discs. GiroDisc describes the part as fitting a variety of Porsche applications with that rear disc, so confirm the original size before ordering.
What are the key dimensions of this rear rotor? GiroDisc lists 380mm outer diameter, 32mm thickness, a 30mm minimum thickness and 72 curved vanes. Each complete assembly weighs 23.1 lb, including the black anodized aluminum hat and the floating hardware that holds the ring. The slotted face keeps the friction surface clean.
Which rings replace the iron on these hats? GiroDisc specifies D2-146 as the replacement ring for this rotor. The rings come in pairs with new mounting hardware and bolt to the existing hats, so the aluminum is bought once and only the iron is renewed afterward. Both sides ship together.
Is a 991 Turbo with ceramic brakes covered? No. This rotor replaces the factory 380mm iron rear disc. A car with Porsche Ceramic Composite Brakes uses different discs and calipers and would need a separate GiroDisc conversion part instead of this rotor. Ask Bulletproof Automotive which part suits that car.
Why are the rotors marked left and right? The 72 vanes are curved and only pump air outward when they sweep with the rotation of the wheel. GiroDisc labels each rotor for its side, and fitting one on the wrong corner sacrifices much of its cooling capacity. Follow the labels.

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 high-carbon 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 380mm Rear Rotors for 991 Porsche 911 Turbo [A2-155]

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GiroDisc 380mm Rear Rotors for 991 Porsche 911 Turbo

Design and Performance

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews