What do the GiroDisc BMW G8X rear rings include?

The GiroDisc BMW G8X rear rings ship as a pair of 380mm rear rings (D2-322) with new mounting hardware. The only parts you reuse are your existing GiroDisc hats, making this a cost-effective refresh of the iron rear conversion.

Which rotors do the GiroDisc BMW G8X rear rings fit?

The GiroDisc BMW G8X rear rings are made for the GiroDisc rear iron rotor conversion (A2-322) on the BMW G8X M3 and M4. You must already own that conversion before fitting these rings.

Do the GiroDisc BMW G8X rear rings work on cars with carbon ceramic brakes?

The GiroDisc BMW G8X rear rings are for the GiroDisc iron conversion that replaces the factory carbon ceramic rears. Once you have run the A2-322 conversion, these are the replacement rings for it.

Will the GiroDisc BMW G8X rear rings fit OEM or other-brand hats?

No. Unless specifically noted, the GiroDisc BMW G8X rear rings work with GiroDisc hats only, including no fitment to factory 2-piece rotor hats. They are not compatible with OEM or other-brand hats.

What is the diameter of the GiroDisc BMW G8X rear rings?

The GiroDisc BMW G8X rear rings have a 380mm rotor outer diameter, matching the GiroDisc rear iron conversion for these vehicles. Replace them at their minimum thickness, or sooner if a crack reaches the edge of the ring.

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Description

GiroDisc Rear 380mm Slotted Replacement Rings for G8x BMW M3/M4 (w/ carbon ceramic brakes)

BMW G8X rear rings from GiroDisc are 380mm rear replacement rotor rings for the GiroDisc rear iron rotor conversion (A2-322) on the 2020+ BMW M3 and M4 (G80/G82/G83) originally equipped with carbon ceramic brakes. Sold in pairs and supplied with fresh mounting hardware, these BMW G8X rear rings let you refresh worn rings while reusing your existing GiroDisc aluminum hats, keeping your iron-converted brakes track-ready at a fraction of the cost of carbon ceramic replacements. They are the wear item for the conversion, so the complete GiroDisc rear iron conversion (A2-322) must be owned first.

Why the GiroDisc BMW G8X Rear Rings?

The GiroDisc BMW G8X rear rings are a direct replacement for the GiroDisc rear iron rotor conversion (A2-322), a cost-effective way to restore braking performance without replacing the complete rotor assembly. Manufactured from GiroDisc’s proprietary high-carbon iron casting, they deliver durability, heat management, and consistent braking. The slotted friction surface enhances pad bite and braking performance, while the serviceable two-piece design lets you reuse your existing GiroDisc aluminum hats, helping reduce long-term maintenance costs versus factory carbon ceramic rotors.

What You Get

The BMW G8X rear rings ship as a pair with fresh mounting hardware, and the only parts you reuse are your existing GiroDisc hats. GiroDisc replacement rings are designed to work with GiroDisc hats only; they are not compatible with OEM or other-brand hats, including factory 2-piece rotor hats. You must already own the complete GiroDisc rear iron conversion (A2-322) before these rings can be used.

When to Replace

GiroDisc recommends replacing the BMW G8X rear rings once they reach their minimum thickness, or sooner if a crack reaches the edge of the ring. Because the hats are reusable, a ring swap restores the assembly without the cost of a full rotor set or a return to carbon ceramic.

Features

380mm rear replacement rotor rings, sold in pairs
Includes fresh mounting hardware
For the GiroDisc rear iron conversion (A2-322) on carbon-ceramic-equipped G8X cars
High-carbon iron rings, proprietary GiroDisc casting
Slotted face for consistent bite
Reuses your existing GiroDisc aluminum hats
Designed to work with GiroDisc hats only, not OEM or other brands
Lowers long-term maintenance cost versus factory carbon ceramic rotors
Manufactured in-house in the USA from domestically sourced materials

Applications

BMW M3: G80 | 2020-present
BMW M4: G82 / G83 | 2020-present

Notes

Sold and priced per pair (one set of rear rings), with replacement hardware included
These are replacement rings only, not a complete rotor. They fit the GiroDisc rear iron conversion rotors (A2-322) and reuse your existing GiroDisc hats, so the complete conversion must be owned first.
GiroDisc replacement rings fit GiroDisc hats only, not OEM or other-brand hats
Replace the rings at their minimum thickness, or sooner if a crack reaches the edge of the ring

Frequently Asked Questions

What do the GiroDisc BMW G8X rear rings include? The GiroDisc BMW G8X rear rings ship as a pair of 380mm rear rings (D2-322) with new mounting hardware. The only parts you reuse are your existing GiroDisc hats, making this a cost-effective refresh of the iron rear conversion.
Which rotors do the GiroDisc BMW G8X rear rings fit? The GiroDisc BMW G8X rear rings are made for the GiroDisc rear iron rotor conversion (A2-322) on the BMW G8X M3 and M4. You must already own that conversion before fitting these rings.
Do the GiroDisc BMW G8X rear rings work on cars with carbon ceramic brakes? The GiroDisc BMW G8X rear rings are for the GiroDisc iron conversion that replaces the factory carbon ceramic rears. Once you have run the A2-322 conversion, these are the replacement rings for it.
Will the GiroDisc BMW G8X rear rings fit OEM or other-brand hats? No. Unless specifically noted, the GiroDisc BMW G8X rear rings work with GiroDisc hats only, including no fitment to factory 2-piece rotor hats. They are not compatible with OEM or other-brand hats.
What is the diameter of the GiroDisc BMW G8X rear rings? The GiroDisc BMW G8X rear rings have a 380mm rotor outer diameter, matching the GiroDisc rear iron conversion for these vehicles. Replace them at their minimum thickness, or sooner if a crack reaches the edge of the ring.

About GiroDisc

GiroDisc is a USA-based brake rotor specialist designing, manufacturing, and selling 2-piece fully floating brake rotors for performance road and track applications. All major components are produced in-house at their facility in Bellingham, Washington, from domestically sourced materials, with hats, rings, and drive pins all made under one roof to GiroDisc’s own specifications. Their rotors are engineered for drivers who demand race-ready performance with the everyday usability and serviceability that street-driven cars require.

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 380mm Slotted Replacement Rings for G8x BMW M3/M4 (w/ carbon ceramic brakes) [D2-322]

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GiroDisc Rear 380mm Slotted Replacement Rings for G8x BMW M3/M4 (w/ carbon ceramic brakes)

Why the GiroDisc BMW G8X Rear Rings?

What You Get

When to Replace

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews