Which vehicles take the GiroDisc Quadrifoglio Rear Iron Rotor Conversion?

The GiroDisc Quadrifoglio Rear Iron Rotor Conversion fits Giulia and Stelvio Quadrifoglio models built with carbon-ceramic rear brakes. It replaces the ceramic discs with 360mm two-piece iron rotors that bolt to the hub and work with the factory calipers. Both models share it.

Should the front and rear be converted together?

Yes, in most cases. Converting both axles puts the vehicle on one friction system front and rear, which keeps the brake behavior predictable. GiroDisc offers the matching A1-209 front conversion for the same Giulia and Stelvio models. Each axle is sold separately.

What diameter is the rear iron rotor?

GiroDisc lists the outer diameter of the matching D2-209 rings as 360mm. Each ring has curved internal vanes and a slotted face, and it floats on ten alloy steel drive pins fixed to a 6061-T6 aluminum hat. The hats are reused at every ring change.

What replaces the iron when it wears?

GiroDisc D2-209 rings, sold in pairs with new hardware, bolt to the existing hats. Replace them at the minimum thickness marked on the hat and ring edge, or sooner if a crack reaches the outer edge of a ring. The hats stay.

Do the rear conversion rotors make noise when the brakes are cold?

No. GiroDisc fits anti-noise spring washers to the drive pins on the ring side. They let the iron ring expand as it heats, which is the purpose of the floating design, while preventing the light rattle that loose floating hardware can make at parking speeds.

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Description

GiroDisc Quadrifoglio Rear Iron Rotor Conversion for Alfa Romeo Giulia and Stelvio

GiroDisc’s Quadrifoglio Rear Iron Rotor Conversion swaps the carbon-ceramic rear discs on the Alfa Romeo Giulia and Stelvio Quadrifoglio for 360mm two-piece floating iron rotors. Paired with the front conversion, it moves the whole vehicle onto iron rings that cost a fraction of ceramic discs to renew. Quadrifoglio owners heading to the track regularly are the ones who will see the savings add up.

Bolt-On and Go

GiroDisc lists the rear conversion as a direct replacement for the OE disc with no modifications: it bolts to the hub and works with the factory calipers. Ten cadmium-plated alloy steel drive pins carry each ring, and anti-noise spring washers let it grow with heat without rattling when cold.

Features

Iron conversion for factory carbon-ceramic rear brakes
360mm rotor outer diameter
10 cadmium-plated alloy steel drive pins
US-sourced 6061-T6 aluminum hat
Curved-vane iron ring poured in the USA
Works with the factory rear calipers

What’s Included

Rear rotor assemblies (L/R)

Applications

Alfa Romeo Giulia Quadrifoglio: with factory carbon-ceramic brakes | 2.9L twin-turbo V6
Alfa Romeo Stelvio Quadrifoglio: with factory carbon-ceramic brakes | 2.9L twin-turbo V6

Notes

The Quadrifoglio Rear Iron Rotor Conversion is for vehicles with factory carbon-ceramic brakes only
Worn rings are renewed with the GiroDisc Quadrifoglio iron conversion rear rings on these hats
The GiroDisc Quadrifoglio front iron rotor conversion covers the front axle
Cap screws are never tightened beyond 60 in-lb (7 Nm)
Stock photography may not depict the actual product

Frequently Asked Questions

Which vehicles take the GiroDisc Quadrifoglio Rear Iron Rotor Conversion? The GiroDisc Quadrifoglio Rear Iron Rotor Conversion fits Giulia and Stelvio Quadrifoglio models built with carbon-ceramic rear brakes. It replaces the ceramic discs with 360mm two-piece iron rotors that bolt to the hub and work with the factory calipers. Both models share it.
Should the front and rear be converted together? Yes, in most cases. Converting both axles puts the vehicle on one friction system front and rear, which keeps the brake behavior predictable. GiroDisc offers the matching A1-209 front conversion for the same Giulia and Stelvio models. Each axle is sold separately.
What diameter is the rear iron rotor? GiroDisc lists the outer diameter of the matching D2-209 rings as 360mm. Each ring has curved internal vanes and a slotted face, and it floats on ten alloy steel drive pins fixed to a 6061-T6 aluminum hat. The hats are reused at every ring change.
What replaces the iron when it wears? GiroDisc D2-209 rings, sold in pairs with new hardware, bolt to the existing hats. Replace them at the minimum thickness marked on the hat and ring edge, or sooner if a crack reaches the outer edge of a ring. The hats stay.
Do the rear conversion rotors make noise when the brakes are cold? No. GiroDisc fits anti-noise spring washers to the drive pins on the ring side. They let the iron ring expand as it heats, which is the purpose of the floating design, while preventing the light rattle that loose floating hardware can make at parking speeds.

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 Quadrifoglio Rear Iron Rotor Conversion for Alfa Romeo Giulia and Stelvio [A2-209]

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GiroDisc Quadrifoglio Rear Iron Rotor Conversion for Alfa Romeo Giulia and Stelvio

Bolt-On and Go

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews