Which cars use the GiroDisc Challenge Rear Replacement Rings?

The Challenge Rear Replacement Rings suit the Ferrari 458 Challenge and the 488 Challenge without the Evo rear brake upgrade, provided the car already runs the GiroDisc A2-183 rear iron conversion. Evo cars take GiroDisc D2-285 rings, which match a different rear rotor.

What is the minimum thickness for the Challenge rear rings?

GiroDisc sets the rear ring minimum at 32mm, from a new thickness of 34mm. A crack that reaches the outer edge also means the ring is finished, whatever its thickness. Measure each ring at several points around the face at every service.

Will these rings bolt straight onto my carbon-ceramic hats?

No. These iron rings are made for the aluminum hats of the GiroDisc rear conversion only. Factory carbon-ceramic assemblies and hats from other makers are not compatible, so the A2-183 rotors need to be installed before these rings can be used.

Does a ring change require new drive pins or screws?

GiroDisc includes new mounting hardware with every pair of rings, so the old fasteners can be retired along with the worn iron. Keep the cap screws at or below 60 in-lb when fitting them so the ring retains its intended float on the hat.

Is there any difference between left and right rear rings?

Yes. The vanes inside each ring curve in one direction so they pump air outward as the wheel turns forward. GiroDisc marks every ring for its side, and swapping them would reduce cooling noticeably during a race stint, so check the markings before bolting each ring to its hat.

Description

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Description

GiroDisc Challenge Rear Replacement Rings for Ferrari 458 and 488

GiroDisc’s Challenge Rear Replacement Rings for the Ferrari 458 and 488 renew the iron on the A2-183 rear conversion without touching the hats. They measure 380mm across and 34mm thick when new, with 72 curved vanes, and come from GiroDisc’s own US foundry iron, machined in-house. These suit the 458 Challenge and the 488 Challenge without the Evo rear brake upgrade. Teams that have already made the switch from carbon ceramic will find the rear rings outlast the fronts, but a spare pair in the truck is cheap insurance.

Fitment and Installation

Each ring bolts to the GiroDisc A2-183 hat already on the car, using the hardware supplied with the pair. They are designed for GiroDisc hats alone and will not suit factory carbon-ceramic assemblies or other brands. Left and right rings are marked so the vanes pump air outward. Torque the cap screws to 60 in-lb (7 Nm) at most.

Features

380mm outer diameter with a 34mm new thickness
72 curved cooling vanes
Proprietary high-carbon iron cast in the USA
Finish machined by GiroDisc in Bellingham, Washington
Left and right rings supplied with new hardware

Specifications

Outer diameter: 380mm
New thickness: 34mm
Minimum thickness: 32mm
Vane count: 72 curved
Fits hats from: GiroDisc A2-183

What’s Included

Rear replacement rings (L/R)
Replacement mounting hardware

Applications

Ferrari 458 Challenge: With GiroDisc A2-183 rear iron conversion
Ferrari 488 Challenge: Without Evo rear brake upgrade, with GiroDisc A2-183 rear iron conversion

Notes

The Challenge Rear Replacement Rings bolt only to the hats of the GiroDisc 458 and 488 Challenge rear iron rotor conversion
Hats are not included and stay on the car
488 Challenge Evo rear brakes use the GiroDisc 296 and 488 Challenge Evo rear replacement rings instead
The front axle takes the GiroDisc 458 and 488 Challenge front replacement rings
Stock photography may not depict the actual product

Frequently Asked Questions

Which cars use the GiroDisc Challenge Rear Replacement Rings? The Challenge Rear Replacement Rings suit the Ferrari 458 Challenge and the 488 Challenge without the Evo rear brake upgrade, provided the car already runs the GiroDisc A2-183 rear iron conversion. Evo cars take GiroDisc D2-285 rings, which match a different rear rotor.
What is the minimum thickness for the Challenge rear rings? GiroDisc sets the rear ring minimum at 32mm, from a new thickness of 34mm. A crack that reaches the outer edge also means the ring is finished, whatever its thickness. Measure each ring at several points around the face at every service.
Will these rings bolt straight onto my carbon-ceramic hats? No. These iron rings are made for the aluminum hats of the GiroDisc rear conversion only. Factory carbon-ceramic assemblies and hats from other makers are not compatible, so the A2-183 rotors need to be installed before these rings can be used.
Does a ring change require new drive pins or screws? GiroDisc includes new mounting hardware with every pair of rings, so the old fasteners can be retired along with the worn iron. Keep the cap screws at or below 60 in-lb when fitting them so the ring retains its intended float on the hat.
Is there any difference between left and right rear rings? Yes. The vanes inside each ring curve in one direction so they pump air outward as the wheel turns forward. GiroDisc marks every ring for its side, and swapping them would reduce cooling noticeably during a race stint, so check the markings before bolting each ring to its hat.

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 Challenge Rear Replacement Rings for Ferrari 458 and 488 [D2-183]

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GiroDisc Challenge Rear Replacement Rings for Ferrari 458 and 488

Fitment and Installation

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews