Which Mustangs do the GiroDisc Front Rotors for S197 fit?

The GiroDisc Front Rotors for S197 fit the Shelby GT500, the Boss 302 and the Mustang GT ordered with the factory Brembo front brake package. They replace the original Brembo-sized front discs and work with the stock calipers. Base-brake GT and V6 cars use a smaller rotor and need a different part.

How much weight do GiroDisc front rotors save on an S197?

GiroDisc weighs its S197 front rotor at about 20.2 lb against roughly 25 lb for the factory part, a saving of nearly 5 lb at each front corner. Because that weight is both rotating and unsprung, the car accelerates and turns in a little more freely.

Will the brake bias or ABS change on a Brembo S197?

No. The rotor keeps the factory diameter and uses the original calipers, so the brake balance and the ABS behavior Ford engineered stay the same. A big brake kit, by contrast, changes rotor and caliper size and can upset that balance.

Can the S197 rings be replaced without buying new hats?

Yes. When the iron rings wear to the minimum thickness marked on the hat and ring edge, GiroDisc sells D1-081 replacement rings that bolt onto the existing aluminum hats with new hardware. The rings are sold in pairs and fit GiroDisc hats only, which keeps the long term running cost well below that of complete rotors.

Does it matter which side each GiroDisc rotor goes on?

Yes. The curved vanes must sweep back from the inner to the outer diameter in the direction of rotation so they pump air outward. GiroDisc labels every rotor for its corner, and a rotor fitted on the wrong side loses most of its cooling, so follow the labels during installation.

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Description

GiroDisc Front Rotors for S197 Ford Mustang GT500, Boss 302 and GT with Brembo Brakes

GiroDisc’s Front Rotors for S197 Ford Mustang GT500, Boss 302 and Brembo-braked GT models replace the one-piece factory discs with a two-piece floating assembly that GiroDisc weighs at about 20.2 lb per corner, against roughly 25 lb for the stock rotor. The rings are cast from GiroDisc’s own iron, poured in the USA and machined in Bellingham, Washington, then floated on a 6061-T6 aluminum hat. For an S197 owner running track days on the factory Brembos, it is the sensible alternative to a big brake kit.

Bolt-On and Go

The rotors bolt to the hub in place of the factory discs and the original Brembo calipers go straight back on; the GiroDisc Front Rotors for S197 need no spacers or machining and leave the brake bias and ABS calibration untouched. Curved internal vanes pump air from the hub out through the rim, and spring washers on the drive pins keep the floating ring quiet when cold.

Features

Roughly 4.8 lb lighter per corner than the factory front rotor, by GiroDisc measurement
US-sourced 6061-T6 aluminum hat
Proprietary cast iron ring, poured in the USA and machined in-house
Curved vanes that pump cooling air through the disc
Cadmium-plated alloy steel drive pins with anti-noise spring washers
Slotted face that sheds water and keeps the friction surface clean

What’s Included

Front rotor assemblies (L/R)

Applications

Ford Mustang Boss 302: S197 | 5.0L V8
Ford Mustang GT with factory Brembo front brakes: S197 | 5.0L V8
Ford Mustang Shelby GT500: S197

Notes

The GiroDisc Front Rotors for S197 fit cars on the factory Brembo front calipers only; base-brake GT and V6 cars use a different rotor
Worn rings are renewed with the GiroDisc S197 front replacement rings, which bolt to these hats
The matching GiroDisc S197 rear rotors complete the set
The cap screws can look loose by design and are never tightened beyond 60 in-lb (7 Nm)
Stock photography may not depict the actual product

Frequently Asked Questions

Which Mustangs do the GiroDisc Front Rotors for S197 fit? The GiroDisc Front Rotors for S197 fit the Shelby GT500, the Boss 302 and the Mustang GT ordered with the factory Brembo front brake package. They replace the original Brembo-sized front discs and work with the stock calipers. Base-brake GT and V6 cars use a smaller rotor and need a different part.
How much weight do GiroDisc front rotors save on an S197? GiroDisc weighs its S197 front rotor at about 20.2 lb against roughly 25 lb for the factory part, a saving of nearly 5 lb at each front corner. Because that weight is both rotating and unsprung, the car accelerates and turns in a little more freely.
Will the brake bias or ABS change on a Brembo S197? No. The rotor keeps the factory diameter and uses the original calipers, so the brake balance and the ABS behavior Ford engineered stay the same. A big brake kit, by contrast, changes rotor and caliper size and can upset that balance.
Can the S197 rings be replaced without buying new hats? Yes. When the iron rings wear to the minimum thickness marked on the hat and ring edge, GiroDisc sells D1-081 replacement rings that bolt onto the existing aluminum hats with new hardware. The rings are sold in pairs and fit GiroDisc hats only, which keeps the long term running cost well below that of complete rotors.
Does it matter which side each GiroDisc rotor goes on? Yes. The curved vanes must sweep back from the inner to the outer diameter in the direction of rotation so they pump air outward. GiroDisc labels every rotor for its corner, and a rotor fitted on the wrong side loses most of its cooling, so follow the labels during installation.

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 Front Rotors for S197 Ford Mustang GT500, Boss 302 and GT with Brembo Brakes [A1-081]

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GiroDisc Front Rotors for S197 Ford Mustang GT500, Boss 302 and GT with Brembo Brakes

Bolt-On and Go

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews