What do the GiroDisc BMW 400mm front rings include?

The GiroDisc BMW 400mm front rings ship as a pair of 400mm front rings (D1-220) with replacement hardware. The only parts you reuse are your existing GiroDisc hats, making this a cost-effective refresh of a worn front rotor assembly.

Do I need the complete rotor first to use the GiroDisc BMW 400mm front rings?

Yes. The GiroDisc BMW 400mm front rings are replacement rings only and fit GiroDisc hats exclusively, so you must already own the complete GiroDisc front rotor assembly (A1-220) before fitting them.

Do the GiroDisc BMW 400mm front rings fit both F8X and G8X cars?

Yes. The GiroDisc BMW 400mm front rings (D1-220) fit the GiroDisc 400mm front rotor assembly (A1-220) on both F8X and G8X BMW M2, M3, and M4, provided you run the 400mm GiroDisc front rotor.

Will the GiroDisc BMW 400mm front rings fit OEM or other-brand hats?

No. Unless specifically noted, the GiroDisc BMW 400mm front 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 difference between the 400mm and 380mm GiroDisc BMW front rings?

The GiroDisc BMW 400mm front rings (D1-220) are for the 400mm A1-220 front rotor, while the 380mm front rings (D1-186 for F8X, D1-282 for G8X) are for the 380mm front rotors. Confirm which GiroDisc front rotor diameter you have before ordering.

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Description

GiroDisc Front 400mm Replacement Rings for F8X BMW M3 / M4

BMW 400mm front rings from GiroDisc are 400mm front replacement rotor rings for the GiroDisc 400mm front rotor assembly (A1-220) on the F8X and G8X BMW M2, M3, and M4. Sold in pairs and supplied with replacement hardware, these GiroDisc BMW 400mm front rings let you refresh worn rings while reusing your existing GiroDisc aluminum hats, a far more economical path than buying complete rotors again. They are the wear item for the two-piece GiroDisc front rotor, so you must already own the complete front rotor assembly (A1-220) before these rings can be used.

Why the GiroDisc BMW 400mm Front Rings?

Because the two-piece GiroDisc design keeps the aluminum hat separate and reusable, you only ever replace the wear item, the ring itself, keeping long-term brake maintenance costs well below a one-piece rotor. The GiroDisc BMW 400mm front rings restore the braking surface of your existing A1-220 front rotors without the cost of a complete new assembly, using the same GiroDisc ring engineering as the original rotors.

Features

400mm front replacement rotor rings, sold in pairs
Includes replacement hardware
For the GiroDisc 400mm front rotor assembly (A1-220)
Fits both F8X and G8X BMW M2, M3, and M4 with the 400mm front rotor
Reuses your existing GiroDisc aluminum hats
Designed to work with GiroDisc hats only, not OEM or other brands
Lowers long-term maintenance cost versus replacing complete rotors
Manufactured in-house in the USA from domestically sourced materials

Applications

BMW M2 / M2 Competition: F87 | 2016-2021
BMW M2: G87 | 2023-present
BMW M3: F80 | 2015-2018
BMW M3: G80 | 2020-present
BMW M4: F82 / F83 | 2015-2020
BMW M4: G82 / G83 | 2020-present

Notes

Sold and priced per pair (one set of front rings), with replacement hardware included
These are replacement rings only, not a complete rotor. They reuse your existing GiroDisc hats and fit GiroDisc hats only, so the complete GiroDisc front rotor assembly (A1-220) must be owned first.
These are the 400mm front rings (D1-220). They are not the 380mm front rings (D1-186 for F8X, D1-282 for G8X); confirm your GiroDisc front rotor diameter before ordering.
Stock photography may not depict the actual product

Frequently Asked Questions

What do the GiroDisc BMW 400mm front rings include? The GiroDisc BMW 400mm front rings ship as a pair of 400mm front rings (D1-220) with replacement hardware. The only parts you reuse are your existing GiroDisc hats, making this a cost-effective refresh of a worn front rotor assembly.
Do I need the complete rotor first to use the GiroDisc BMW 400mm front rings? Yes. The GiroDisc BMW 400mm front rings are replacement rings only and fit GiroDisc hats exclusively, so you must already own the complete GiroDisc front rotor assembly (A1-220) before fitting them.
Do the GiroDisc BMW 400mm front rings fit both F8X and G8X cars? Yes. The GiroDisc BMW 400mm front rings (D1-220) fit the GiroDisc 400mm front rotor assembly (A1-220) on both F8X and G8X BMW M2, M3, and M4, provided you run the 400mm GiroDisc front rotor.
Will the GiroDisc BMW 400mm front rings fit OEM or other-brand hats? No. Unless specifically noted, the GiroDisc BMW 400mm front 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 difference between the 400mm and 380mm GiroDisc BMW front rings? The GiroDisc BMW 400mm front rings (D1-220) are for the 400mm A1-220 front rotor, while the 380mm front rings (D1-186 for F8X, D1-282 for G8X) are for the 380mm front rotors. Confirm which GiroDisc front rotor diameter you have before ordering.

About GiroDisc

GiroDisc designs, manufactures, and sells two-piece, fully floating brake rotors for a wide range of performance vehicles. Every major component, including the hats, rings, and drive pins, is made in-house in Bellingham, Washington, from domestically sourced materials. A proprietary high-carbon iron ring formulated for superior metallurgy and thermal performance pairs with reusable machined-aluminum hats to lower the long-term cost of running a high-performance brake system. The two-piece floating design sheds unsprung and rotating mass while staying street-friendly, delivering race-proven braking for track and street 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 400mm Replacement Rings for F8X BMW M3 / M4 [D1-220]

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GiroDisc Front 400mm Replacement Rings for F8X BMW M3 / M4

Why the GiroDisc BMW 400mm Front Rings?

Features

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Notes

Frequently Asked Questions

About GiroDisc

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