How much weight do the GiroDisc Rear Rotors for S197 save?

GiroDisc weighs the GiroDisc Rear Rotors for S197 at about 9.5 lb each, against approximately 13 lb for the factory Mustang rear disc. That saves roughly 3.5 lb of rotating and unsprung mass at each rear corner, which GiroDisc says helps acceleration and suspension response.

Do the S197 rear rotors fit the 2013 and 2014 Shelby GT500?

No. GiroDisc lists a separate rear rotor, A2-091, for the 2013 and 2014 Shelby GT500. This A2-081 part is listed for the S197 Mustang generally, so a late GT500 owner should order the dedicated GT500 rotor instead. Check the model year first.

Are the Mustang rear calipers modified?

No. GiroDisc describes the rotor as a direct replacement for the original disc with no modifications necessary. The stock rear calipers bolt straight back on, so the brake bias and ABS calibration Ford set for the car stay as they were.

What part renews the S197 rear iron later on?

GiroDisc lists D2-081 as the rear replacement ring pair for the S197 Mustang. The rings come with new hardware and bolt to the existing aluminum hats once the original iron reaches its marked minimum thickness or shows a crack to the edge.

Will floating rear rotors rattle on a Mustang?

No. GiroDisc mounts the drive pins with anti-noise spring washers on the rotor side. They allow the ring to expand as it heats but hold it firmly when cold, which removes the rattle associated with floating rotors during everyday driving.

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Description

GiroDisc Rear Rotors for S197 Ford Mustang

GiroDisc’s Rear Rotors for S197 Ford Mustang come in at about 9.5 lb each by GiroDisc’s measurement, where the factory rear disc weighs roughly 13 lb, so each rear corner loses about 3.5 lb of rotating and unsprung mass. The rotor is a direct replacement that bolts to the hub and works with the stock rear calipers. Rings are GiroDisc iron, poured in the USA and machined in Bellingham, Washington, floating on 6061-T6 aluminum hats. For an S197 already on GiroDisc fronts, this pair finishes the car.

Bolt-On and Go

The GiroDisc Rear Rotors for S197 go on in place of the factory discs without modification, and because the calipers stay, the brake bias and ABS efficiency are unchanged. High-strength alloy steel drive pins, made by GiroDisc and cadmium plated, carry the load between ring and hat and are secured by grade 12 cap screws with hardened washers. Curved vanes push cooling air from the hub outward.

Features

About 3.5 lb lighter per rotor than the factory part, by GiroDisc measurement
Direct replacement with the stock rear calipers
Cadmium-plated alloy steel drive pins
Grade 12 cap screws with hardened washers
Curved vanes acting as a centrifugal pump
Anti-noise spring washers for quiet float

What’s Included

Rear rotor assemblies (L/R)

Applications

Ford Mustang: S197

Notes

Worn rear iron is replaced with the GiroDisc S197 rear replacement rings on these hats
The front axle partner is the GiroDisc S197 Brembo front rotors
GiroDisc lists a separate rear rotor for the 2013-2014 Shelby GT500
Stock photography may not depict the actual product

Frequently Asked Questions

How much weight do the GiroDisc Rear Rotors for S197 save? GiroDisc weighs the GiroDisc Rear Rotors for S197 at about 9.5 lb each, against approximately 13 lb for the factory Mustang rear disc. That saves roughly 3.5 lb of rotating and unsprung mass at each rear corner, which GiroDisc says helps acceleration and suspension response.
Do the S197 rear rotors fit the 2013 and 2014 Shelby GT500? No. GiroDisc lists a separate rear rotor, A2-091, for the 2013 and 2014 Shelby GT500. This A2-081 part is listed for the S197 Mustang generally, so a late GT500 owner should order the dedicated GT500 rotor instead. Check the model year first.
Are the Mustang rear calipers modified? No. GiroDisc describes the rotor as a direct replacement for the original disc with no modifications necessary. The stock rear calipers bolt straight back on, so the brake bias and ABS calibration Ford set for the car stay as they were.
What part renews the S197 rear iron later on? GiroDisc lists D2-081 as the rear replacement ring pair for the S197 Mustang. The rings come with new hardware and bolt to the existing aluminum hats once the original iron reaches its marked minimum thickness or shows a crack to the edge.
Will floating rear rotors rattle on a Mustang? No. GiroDisc mounts the drive pins with anti-noise spring washers on the rotor side. They allow the ring to expand as it heats but hold it firmly when cold, which removes the rattle associated with floating rotors during everyday driving.

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 S197 Ford Mustang [A2-081]

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GiroDisc Rear Rotors for S197 Ford Mustang

Bolt-On and Go

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews