Which S650 Mustangs take the GiroDisc Rear Rotors for S650?

The GiroDisc Rear Rotors for S650 fit the Mustang GT with the Performance Package, the Dark Horse and the Dark Horse SC on the 355mm four-piston Brembo rear brakes with iron discs. Cars that left the factory with the optional carbon ceramic brakes are excluded.

Is any modification needed to fit these rear rotors?

No. GiroDisc designs them as a direct replacement for the factory rear discs, so the four-piston Brembo calipers bolt straight back on and the rear brake bias is unchanged. The ABS system sees the same diameter and needs no recalibration after installation.

What are the rear ring dimensions and wear limit?

Each rear ring measures 355mm across and 28mm thick, with 48 curved vanes inside. GiroDisc sets the minimum thickness at 26mm and marks it on the hat and on the ring edge, so wear is easy to check with a micrometer at every service.

Can the rear hats be reused after the rings wear out?

Yes. The aluminum hats are designed to be kept, and new rings are fitted to them when the old ones reach 26mm or develop a crack running to the edge. The matching part is GiroDisc D2-343, supplied as a pair with replacement hardware.

Why does a two-piece rear rotor help a Mustang on track?

A two-piece disc lets the iron ring expand with heat while the aluminum hat stays true, which helps the rotor survive repeated heat cycles. It also sheds unsprung weight and rotating mass, and the curved vanes keep moving air through the disc between braking zones.

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Description

GiroDisc Rear Rotors for S650 Ford Mustang with 4-Piston Brembo Brakes

GiroDisc’s Rear Rotors for S650 Mustangs fitted with the 355mm four-piston Brembo rear brakes give the back axle the same two-piece floating construction as the front set. GiroDisc rates each assembly at 18.4 lb, with a 355mm by 28mm ring, 48 curved vanes and a 26mm wear limit. It covers the GT Performance Package, Dark Horse and Dark Horse SC on iron brakes. Anyone who has already fitted GiroDisc fronts should finish the job here, so all four corners share the same metallurgy and service routine.

Construction

Hats, rings and drive pins are all produced in-house in Bellingham, Washington from domestically sourced material. The hat is 6061-T6 aluminum in black anodize; the cadmium-plated pins resist corrosion, and spring washers keep the floating ring silent on cold mornings. Curved vanes act as a centrifugal pump, pulling air through the hub to cool the disc.

Features

355mm x 28mm ring with 48 curved cooling vanes
18.4 lb per assembly, by GiroDisc measurement
Reusable black anodized aluminum hat
High-carbon iron ring for repeated hard stops
Spring clips and spring washers for quiet street manners
Slotted face to keep the friction surface clean

Specifications

Outer diameter: 355mm
Thickness: 28mm
Minimum thickness: 26mm
Weight: 18.4 lb per rotor assembly
Vane count: 48 curved vanes

What’s Included

Rear rotor assemblies (L/R)

Applications

Ford Mustang Dark Horse: S650 | 5.0L V8
Ford Mustang Dark Horse SC: S650
Ford Mustang GT with Performance Package: S650 | 5.0L V8

Notes

The GiroDisc Rear Rotors for S650 suit iron-braked cars only; cars with the optional carbon ceramic brakes are not covered
Worn rings are renewed with the GiroDisc S650 rear replacement rings, which bolt to these hats
Pair them with the GiroDisc S650 front rotors for the six-piston Brembo front calipers
Stock photography may not depict the actual product

Frequently Asked Questions

Which S650 Mustangs take the GiroDisc Rear Rotors for S650? The GiroDisc Rear Rotors for S650 fit the Mustang GT with the Performance Package, the Dark Horse and the Dark Horse SC on the 355mm four-piston Brembo rear brakes with iron discs. Cars that left the factory with the optional carbon ceramic brakes are excluded.
Is any modification needed to fit these rear rotors? No. GiroDisc designs them as a direct replacement for the factory rear discs, so the four-piston Brembo calipers bolt straight back on and the rear brake bias is unchanged. The ABS system sees the same diameter and needs no recalibration after installation.
What are the rear ring dimensions and wear limit? Each rear ring measures 355mm across and 28mm thick, with 48 curved vanes inside. GiroDisc sets the minimum thickness at 26mm and marks it on the hat and on the ring edge, so wear is easy to check with a micrometer at every service.
Can the rear hats be reused after the rings wear out? Yes. The aluminum hats are designed to be kept, and new rings are fitted to them when the old ones reach 26mm or develop a crack running to the edge. The matching part is GiroDisc D2-343, supplied as a pair with replacement hardware.
Why does a two-piece rear rotor help a Mustang on track? A two-piece disc lets the iron ring expand with heat while the aluminum hat stays true, which helps the rotor survive repeated heat cycles. It also sheds unsprung weight and rotating mass, and the curved vanes keep moving air through the disc between braking zones.

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 Rear Rotors for S650 Ford Mustang with 4-Piston Brembo Brakes [A2-343]

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GiroDisc Rear Rotors for S650 Ford Mustang with 4-Piston Brembo Brakes

Construction

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews