Which rotors do the GiroDisc Front Replacement Rings for R35 fit?

The GiroDisc Front Replacement Rings for R35 fit the GiroDisc A1-232 390mm front rotor used on 2012 and later Nissan GT-R models, and they bolt to the existing GiroDisc hats. The 2007 to 2011 cars run a 380mm front rotor and need GiroDisc D1-249 front rings, a different part.

Can these rings be fitted to the factory GT-R front rotor hats?

No. GiroDisc designs its replacement rings for GiroDisc hats only and states that they do not fit hats from other brands, including hats from cars equipped with two-piece rotors from the factory. A GT-R on factory front rotors needs the complete GiroDisc 390mm front rotor first.

What is included with the GiroDisc front rings?

The rings come as a pair, one left and one right, with replacement mounting hardware. The only parts carried over from the existing rotors are the GiroDisc aluminum hats, so the drive pin hardware is renewed with the iron and the float is rebuilt the way GiroDisc assembles it new.

When should the front rings be replaced?

GiroDisc marks the minimum thickness on the center hat and on the outer edge of the ring, and the rings are replaced when they reach it. GiroDisc treats brake rotors as consumable racing parts, so a GT-R used on track should have its rings inspected for wear, fatigue and damage at regular intervals.

Should fresh front rings be bedded before track use?

Yes. GiroDisc recommends bedding whenever a new disc or friction material goes on. The rings are bedded with light to moderate stops that bring the surface to about 700 to 800 F, then cooled without dragging the brakes, and new pads are bedded afterwards to the instructions from their maker.

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Description

GiroDisc 390mm Front Replacement Rings for R35 Nissan GT-R (2012-2025)

GiroDisc’s Front Replacement Rings for R35 Nissan GT-R cars from 2012 onward renew the 390mm iron on GiroDisc A1-232 front rotors while the aluminum hats stay bolted to the hubs. Renewing only the iron is the reason a two-piece front axle costs less to own over time, and the hardware that holds the float together comes new in the box. The castings are GiroDisc’s own, poured in the USA and machined in Bellingham, Washington, with the curved internal vanes that pull air through the disc under hard braking. A late GT-R that works its front brakes hard on track will go through rings long before it ever needs new hats.

Fitment and Installation

These rings are for the 390mm GiroDisc front rotor fitted to 2012 and later cars and nothing else. They mount to GiroDisc hats only, not to the factory rotor hats or to hats from another maker, and the 2007 to 2011 cars, which run a 380mm front disc, take the D1-249 ring instead. The pair is handed left and right because the vanes are curved, and GiroDisc publishes a ring assembly guide for the swap.

Features

GiroDisc Front Replacement Rings for R35 390mm front rotors
Curved vanes that work as a centrifugal pump for cooling
Slotted friction face that cleans the pads and sheds water
Iron cast in the USA and machined by GiroDisc
Reuses the existing GiroDisc aluminum hats
Minimum thickness marked on the ring edge

What’s Included

Front replacement rings (L/R)
Replacement mounting hardware

Applications

Nissan GT-R: R35 | 2012-2025 | 3.8L VR38DETT

Notes

These rings fit GiroDisc hats only, from the GiroDisc 390mm front rotors, and not factory or other-brand hats
2007-2011 cars use the GiroDisc 380mm front replacement rings instead
The matching rear rings are the GiroDisc rear replacement rings
Replace the rings at the minimum thickness marked on the hat and the ring edge
Stock photography may not depict the actual product

Frequently Asked Questions

Which rotors do the GiroDisc Front Replacement Rings for R35 fit? The GiroDisc Front Replacement Rings for R35 fit the GiroDisc A1-232 390mm front rotor used on 2012 and later Nissan GT-R models, and they bolt to the existing GiroDisc hats. The 2007 to 2011 cars run a 380mm front rotor and need GiroDisc D1-249 front rings, a different part.
Can these rings be fitted to the factory GT-R front rotor hats? No. GiroDisc designs its replacement rings for GiroDisc hats only and states that they do not fit hats from other brands, including hats from cars equipped with two-piece rotors from the factory. A GT-R on factory front rotors needs the complete GiroDisc 390mm front rotor first.
What is included with the GiroDisc front rings? The rings come as a pair, one left and one right, with replacement mounting hardware. The only parts carried over from the existing rotors are the GiroDisc aluminum hats, so the drive pin hardware is renewed with the iron and the float is rebuilt the way GiroDisc assembles it new.
When should the front rings be replaced? GiroDisc marks the minimum thickness on the center hat and on the outer edge of the ring, and the rings are replaced when they reach it. GiroDisc treats brake rotors as consumable racing parts, so a GT-R used on track should have its rings inspected for wear, fatigue and damage at regular intervals.
Should fresh front rings be bedded before track use? Yes. GiroDisc recommends bedding whenever a new disc or friction material goes on. The rings are bedded with light to moderate stops that bring the surface to about 700 to 800 F, then cooled without dragging the brakes, and new pads are bedded afterwards to the instructions from their maker.

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 390mm Front Replacement Rings for R35 Nissan GT-R (2012-2025) [D1-232]

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GiroDisc 390mm Front Replacement Rings for R35 Nissan GT-R (2012-2025)

Fitment and Installation

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews