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

SKU: GIRA1-282
Price
$1,350.00
In Stock and Ready to Ship!

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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
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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 braking performance of your BMW G8X M2, M3, or M4 with the GiroDisc 380mm Two-Piece Front Rotor Kit. Designed as a direct replacement for vehicles equipped with factory iron brakes, these fully floating rotors retain the factory 380mm diameter and OEM brake calipers while improving cooling capability and reducing unnecessary rotating and unsprung mass.

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

Cooling performance is a major advantage of the GiroDisc design. Each rotor incorporates 72 curved internal cooling vanes compared with just 30 vanes in the factory discs. These directional vanes act as a centrifugal pump, drawing air through the center of the rotor and helping evacuate heat during repeated hard braking.

The fully floating mounting system allows the friction ring to expand independently as temperatures increase while maintaining proper alignment with the brake pads. GiroDisc uses high-strength alloy-steel drive pins, spring clips, and spring washers to provide the thermal benefits of a race-oriented floating rotor while remaining quiet enough for street use.

For G8X owners looking for a brake upgrade without moving to a complete big brake kit, GiroDisc's A1-282 provides improved thermal management, serviceability, and motorsport-derived construction while retaining the factory calipers and brake system architecture.

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 front rotors

  • Retains the factory front brake calipers

  • No permanent vehicle modifications required

  • Replacement friction rings are available separately as GiroDisc D1-282

Included

  • 1 GiroDisc left front two-piece rotor assembly

  • 1 GiroDisc right front 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: A1-282

  • Product Type: Two-Piece Fully Floating Front Rotors

  • Rotor Diameter: 380mm

  • Rotor Thickness: 36mm

  • Minimum Rotor Thickness: 34mm

  • Weight: 28.2 lb per rotor assembly

  • Cooling Vanes: 72 Curved Vanes

  • Factory Cooling Vanes: 30

  • 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 Alloy Steel

  • Drive Pin Finish: Cadmium Plated

  • Rotor Design: Fully Floating

  • Replacement Ring Part Number: D1-282

  • Manufacturing Location: Bellingham, Washington, USA

  • Quantity: Sold as a Pair

Product Features

  • 72 curved cooling vanes versus 30 in the factory rotors provide substantially greater internal airflow and heat evacuation during repeated hard braking

  • Fully floating two-piece construction allows the rotor ring to expand under extreme temperatures while maintaining proper alignment with the brake pads

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

  • Proprietary high-carbon iron friction rings are engineered to withstand the elevated temperatures and repeated heat cycles associated with performance driving and track use

  • Reusable center hats and replaceable D1-282 friction rings reduce long-term servicing costs once the original rings reach their wear limit

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