Do the GiroDisc Rear Rotors for S550 suit a GT350 used on track?

Yes. The GiroDisc Rear Rotors for S550 GT350 use curved vanes that pump air out through the disc and a floating ring that can expand with heat. Pairing them with the GiroDisc front set gives the car matching two-piece construction at both ends for track days.

Why choose a two-piece rear rotor over a one-piece disc on the GT350?

A two-piece design separates the iron friction ring from an aluminum hat. The hat is reused for the life of the car, so later brake work only needs new rings, and the floating mount lets the ring expand with heat on its drive pins.

Which rings replace worn GT350 rear rotors from GiroDisc?

GiroDisc D2-162 rear replacement rings. They come in pairs with new hardware and bolt to the existing GiroDisc hats. They are not designed for other brands or factory two-piece hats, so they suit cars already fitted with these A2-162 rear rotors.

Will the GT350 rear calipers need any changes?

No. GiroDisc states this rotor is a direct replacement for the original rear disc and works with the factory calipers without modification. The calipers come off, the new rotors go on and the calipers refit to the same mounting points.

What torque applies to the drive pin cap screws on these rotors?

The cap screws are never tightened beyond 60 in-lb, or 7 Nm. They are set so the ring can float on its pins, and a screw that seems loose to the touch is normal on a GiroDisc rotor. Clamping it harder works against the floating design.

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Description

GiroDisc Rear Rotors for S550 Ford Mustang Shelby GT350

GiroDisc’s Rear Rotors for S550 Ford Mustang Shelby GT350 finish the job the front set starts, swapping the factory 380mm rear discs for two-piece floating assemblies that need no modification to fit. The rear axle sees less heat than the front, yet on a road course it still benefits from curved vanes that pump air outward and from a 6061-T6 aluminum hat that outlasts several sets of iron rings. Twelve drive pins carry the load between ring and hat.

Design and Performance

The Rear Rotors for S550 GT350 bolt directly to the car and work with the original rear calipers. Each ring is cast iron to the specification GiroDisc uses for racing, held to the hat by cadmium-plated alloy steel pins and class 12.9 cap screws with hardened washers. Spring washers on the pins allow heat growth without noise.

Features

380mm outer diameter matching the factory GT350 rear disc
No modifications needed; original rear calipers are retained
Curved internal vanes for centrifugal airflow
12 high-strength alloy steel drive pins made by GiroDisc
Anti-noise spring washers on every pin
Slotted face that clears the friction surface

What’s Included

Rear rotor assemblies (L/R)

Applications

Ford Mustang Shelby GT350: S550 | 5.2L V8

Notes

Worn rings are renewed with the GiroDisc GT350 rear replacement rings, which bolt to these hats
The GiroDisc GT350 front rotors cover the front axle
Rotors are handed and labeled for their corner
Stock photography may not depict the actual product

Frequently Asked Questions

Do the GiroDisc Rear Rotors for S550 suit a GT350 used on track? Yes. The GiroDisc Rear Rotors for S550 GT350 use curved vanes that pump air out through the disc and a floating ring that can expand with heat. Pairing them with the GiroDisc front set gives the car matching two-piece construction at both ends for track days.
Why choose a two-piece rear rotor over a one-piece disc on the GT350? A two-piece design separates the iron friction ring from an aluminum hat. The hat is reused for the life of the car, so later brake work only needs new rings, and the floating mount lets the ring expand with heat on its drive pins.
Which rings replace worn GT350 rear rotors from GiroDisc? GiroDisc D2-162 rear replacement rings. They come in pairs with new hardware and bolt to the existing GiroDisc hats. They are not designed for other brands or factory two-piece hats, so they suit cars already fitted with these A2-162 rear rotors.
Will the GT350 rear calipers need any changes? No. GiroDisc states this rotor is a direct replacement for the original rear disc and works with the factory calipers without modification. The calipers come off, the new rotors go on and the calipers refit to the same mounting points.
What torque applies to the drive pin cap screws on these rotors? The cap screws are never tightened beyond 60 in-lb, or 7 Nm. They are set so the ring can float on its pins, and a screw that seems loose to the touch is normal on a GiroDisc rotor. Clamping it harder works against the floating design.

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 S550 Ford Mustang Shelby GT350 [A2-162]

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GiroDisc Rear Rotors for S550 Ford Mustang Shelby GT350

Design and Performance

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews