What do the GiroDisc BMW G8X rear rotors replace?

The GiroDisc BMW G8X rear rotors are a 2-piece iron conversion that directly replaces the factory 380mm carbon ceramic rear rotors on the G8X M3 and M4. They use the factory calipers and require no modifications other than switching the rotors and pads.

Which brake pads do the GiroDisc BMW G8X rear rotors use?

The GiroDisc BMW G8X rear rotors use the factory iron pad shape with the carbon ceramic calipers. Because the caliper is the carbon ceramic unit but the rotor is now iron, the correct pad is the factory iron pad shape; contact us if you need help finding the right pads.

Why convert from carbon ceramic to the GiroDisc BMW G8X rear rotors?

The GiroDisc BMW G8X rear rotors move you to a serviceable 2-piece iron rotor that is far more cost-effective than replacing factory carbon ceramic rotors, especially for track use. The high-carbon iron rings and 72 curved cooling vanes deliver durable, consistent braking under hard use.

What happens when the GiroDisc BMW G8X rear rotor rings wear out?

Only the rings need replacing, not the full assembly. The reusable 6061-T6 aluminum hat is retained, and new rings (D2-322) attach to it, keeping ongoing maintenance well below factory carbon ceramic replacement cost.

Which models do the GiroDisc BMW G8X rear rotors fit?

The GiroDisc BMW G8X rear rotors fit the 2020-present BMW M3 (G80) and M4 (G82/G83) that came with factory carbon ceramic brakes. They are sold and priced per pair.

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Description

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

BMW G8X rear rotors from GiroDisc are a 2-piece, fully floating 380mm iron rotor conversion, a direct replacement for the factory 380mm carbon ceramic rear rotors on the BMW G8X M3 and M4. These GiroDisc BMW G8X rear rotors use the factory calipers and require no modifications other than switching the rotors and pads, letting carbon-ceramic-equipped owners move to serviceable, cost-effective iron rotors without a big brake kit. The rings are machined from a proprietary high-carbon iron casting, and 72 curved vanes act as a centrifugal pump that pulls air through the hub to cool the rotor under hard use. Sold and priced per pair.

Why the GiroDisc BMW G8X Rear Rotors?

The GiroDisc BMW G8X rear rotors let owners of carbon-ceramic-equipped M3 and M4 models switch to a 2-piece iron rotor that is far more cost-effective to maintain, especially for track use where carbon ceramic replacement is prohibitively expensive. The rings are machined from a proprietary casting of high-carbon iron formulated to GiroDisc’s specifications, with superior metallurgy that holds up better under repeated hard stops. The 72 curved vanes act as a centrifugal pump, pulling air in through the hub to effectively cool the rotors, and the assembly uses spring clips and Belleville washers for race-ready float that stays quiet on the street.

Direct Replacement, Factory Calipers

The GiroDisc BMW G8X rear rotors are a direct replacement for the 380mm carbon ceramic rear rotors, using the factory calipers with no modifications other than switching the rotors and pads. Note that these rotors use the factory iron pad shape with the carbon ceramic calipers; contact us if you need help finding the correct pads. The reusable 6061-T6 aluminum hat is finished in black anodize, and the drive pins are high-strength steel alloy, cadmium-plated for corrosion resistance. All major components, including the hats, rings, and drive pins, are manufactured in-house in Bellingham, WA, from domestically sourced materials.

A Reusable Two-Piece Design

The 2-piece design of the GiroDisc BMW G8X rear rotors means the aluminum hat is reusable. When the rings wear out, you replace only the rings (GiroDisc part number D2-322) and reuse your existing hats, keeping long-term cost well below factory carbon ceramic replacement. GiroDisc recommends replacing the rings at a minimum thickness of 26mm, or sooner if a crack reaches the edge of the ring.

Features

2-piece, fully floating 380mm rear iron rotor conversion
Direct replacement for the factory 380mm carbon ceramic rear rotors
Uses the factory calipers, no modifications beyond rotors and pads
Uses the factory iron pad shape with the carbon ceramic calipers
High-carbon iron rings, proprietary GiroDisc casting
72 curved cooling vanes that pump air through the hub
Reusable 6061-T6 aluminum hat with black anodize finish
High-strength steel alloy drive pins, cadmium-plated for corrosion resistance
Spring clips and Belleville washers for race-ready float with no street noise
Rings replaceable separately (D2-322) using the reusable hats
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 rotors)
Fitment: use these rotors with the factory iron pad shape and the carbon ceramic calipers. Contact us for help finding the correct pads.
This is the complete rotor conversion. When the rings wear, replacement rings (D2-322) reuse your existing GiroDisc hats and fit GiroDisc hats only, not OEM or other-brand hats.
Replace the rings at a minimum thickness of 26mm, or sooner if a crack reaches the edge of the ring
Stock photography may not depict the actual product

Frequently Asked Questions

What do the GiroDisc BMW G8X rear rotors replace? The GiroDisc BMW G8X rear rotors are a 2-piece iron conversion that directly replaces the factory 380mm carbon ceramic rear rotors on the G8X M3 and M4. They use the factory calipers and require no modifications other than switching the rotors and pads.
Which brake pads do the GiroDisc BMW G8X rear rotors use? The GiroDisc BMW G8X rear rotors use the factory iron pad shape with the carbon ceramic calipers. Because the caliper is the carbon ceramic unit but the rotor is now iron, the correct pad is the factory iron pad shape; contact us if you need help finding the right pads.
Why convert from carbon ceramic to the GiroDisc BMW G8X rear rotors? The GiroDisc BMW G8X rear rotors move you to a serviceable 2-piece iron rotor that is far more cost-effective than replacing factory carbon ceramic rotors, especially for track use. The high-carbon iron rings and 72 curved cooling vanes deliver durable, consistent braking under hard use.
What happens when the GiroDisc BMW G8X rear rotor rings wear out? Only the rings need replacing, not the full assembly. The reusable 6061-T6 aluminum hat is retained, and new rings (D2-322) attach to it, keeping ongoing maintenance well below factory carbon ceramic replacement cost.
Which models do the GiroDisc BMW G8X rear rotors fit? The GiroDisc BMW G8X rear rotors fit the 2020-present BMW M3 (G80) and M4 (G82 / G83) that came with factory carbon ceramic brakes. They are sold and priced per pair.

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 380mm Slotted Rotors for G8x BMW M3 and M4 (w/ carbon ceramic brakes) [A2-322]

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

Why the GiroDisc BMW G8X Rear Rotors?

Direct Replacement, Factory Calipers

A Reusable Two-Piece Design

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews