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Girodisc 2 Piece Rear Rotors BMW G87 M2 / G80 M3 / G82 M4 (OE Iron Rotors)

SKU: GIRA2-282
Price
$1,350.00
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

FAQ

Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested.

International Shipping
Any and all customs duties, taxes, import fees, and/or tariffs assessed in connection with the purchase shall be the sole responsibility of the customer/end user.

Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unused and in its original packaging. All returns are subject to a restocking fee based on item and package condition. Buyer is responsible for paying for return shipping costs. If you need a return label, we will email you a return label and deduct cost from refund. Original shipping costs are not refundable. Special order items are not eligible for return.

Cancellation Policy
In order to cancel your order you must email within 24 hours of placing your order or before your order has shipped, whichever occurs first. Special order items are not eligible for cancelation.

Exchange Policy
We have a 30-day exchange policy, which means you have 30 days after receiving your item to request an exchange. To be eligible for an exchange, your item must be brand new in box. Buyer is responsible for paying all shipping costs to exchange product.

Product Description

Upgrade the rear braking system of your BMW G8X M2, M3, or M4 with the GiroDisc 370mm Two-Piece Rear Rotor Kit. Designed as a direct replacement for vehicles equipped with factory iron brakes, these fully floating rotors retain the factory brake system architecture while improving thermal management and reducing unnecessary unsprung and rotating mass.

Each GiroDisc rotor combines a proprietary high-carbon iron friction ring with a lightweight 6061-T6 aluminum center hat. The two-piece construction allows the friction ring to be replaced independently when worn, allowing the center hat to be reused and reducing long-term servicing costs.

GiroDisc utilizes 48 curved internal cooling vanes that act as a centrifugal pump, pulling air through the center of the rotor and efficiently evacuating heat during repeated hard braking. This increased thermal management makes the rotors particularly well suited for aggressive street driving and track use.

The fully floating design allows the iron friction ring to expand independently as temperatures increase while maintaining proper alignment with the brake pads. High-strength alloy-steel drive pins, spring clips, and Belleville washers provide race-ready rotor float while remaining quiet enough for regular street use.

Pair these rear rotors with the GiroDisc A1-282 380mm Front Rotor Kit for a complete two-piece GiroDisc brake rotor upgrade on your G8X M2, M3, or M4.

Fitment Notes

  • Fits BMW G87 M2

  • Fits BMW G80 M3

  • Fits BMW G82 M4 Coupe

  • Fits BMW G83 M4 Convertible

  • Designed for vehicles equipped with factory iron brakes

  • Does not fit factory carbon ceramic brake applications

  • Direct replacement for the factory rear rotors

  • Retains the factory rear brake system

  • No permanent vehicle modifications required

  • Replacement friction rings are available separately as GiroDisc D2-282

  • Pairs with GiroDisc A1-282 380mm Front Rotors

Included

  • 1 GiroDisc left rear two-piece rotor assembly

  • 1 GiroDisc right rear two-piece rotor assembly

  • Reusable 6061-T6 aluminum rotor hats

  • GiroDisc high-carbon iron friction rings

  • Fully floating drive hardware

Product Specs

  • GiroDisc Part Number: A2-282

  • Product Type: Two-Piece Fully Floating Rear Rotors

  • Rotor Diameter: 370mm

  • Minimum Replacement Thickness: 22mm

  • Cooling Vanes: 48 Curved Vanes

  • Friction Ring Material: GiroDisc Proprietary High-Carbon Cast Iron

  • Center Hat Material: 6061-T6 Aluminum

  • Center Hat Finish: Black Anodized

  • Drive Pin Material: High-Strength Steel Alloy

  • Drive Pin Finish: Cadmium Plated

  • Rotor Design: Fully Floating

  • Floating Hardware: Spring Clips and Belleville Washers

  • Replacement Ring Part Number: D2-282

  • Manufacturing Location: Bellingham, Washington, USA

  • Quantity: Sold as a Pair

Product Features

  • 48 curved internal cooling vanes act as a centrifugal pump to move air through the rotor and improve heat evacuation during demanding braking

  • Fully floating two-piece construction allows the friction ring to expand under high temperatures while maintaining proper brake-pad alignment

  • Lightweight 6061-T6 aluminum center hats help reduce unsprung and rotating mass compared with conventional one-piece rotor construction

  • Proprietary high-carbon iron friction rings are engineered to withstand repeated high-temperature braking and demanding performance use

  • Reusable center hats and replaceable D2-282 friction rings allow worn rings to be serviced without replacing the complete rotor assembly

  • Manufactured in-house by GiroDisc in Bellingham, Washington using domestically sourced materials for all major components