GiroDisc BMW G80/G81 M3, G82/G83 M4 & G87 M2 2-Piece Front Brake Discs/Rotors Pair

Designed for drivers who demand exceptional braking performance on both road and track, the GiroDisc 2-Piece Front Brake Discs are a direct replacement upgrade for the factory steel front brake discs fitted to the BMW G80 M3, G81 M3 Touring, G82 M4, G83 M4 Convertible and G87 M2. Featuring a fully floating two-piece design, these premium rotors reduce unsprung weight, improve heat management and provide the durability required for high-performance driving environments.

Manufactured in the USA using GiroDisc's proprietary high-carbon iron alloy, these front brake discs are engineered to withstand repeated heavy braking while maintaining consistent pedal feel and braking performance. Whether you're building a dedicated track car or simply looking for a superior braking solution for spirited road driving, GiroDisc rotors offer a significant upgrade over conventional one-piece discs.

Key Features

• Direct replacement for factory front steel brake discs
• Designed for BMW G80/G81 M3, G82/G83 M4 & G87 M2
• GiroDisc part number: A1-282
• Fully floating 2-piece rotor design
• Reduces unsprung and rotating mass
• Proprietary high-carbon iron rotor rings
• Reusable aluminium hats
• 72 curved internal cooling vanes
• Race-proven performance
• Suitable for fast road and track use
• Sold as a pair

Lightweight 2-Piece Construction

Unlike conventional one-piece brake discs, GiroDisc rotors utilise a lightweight two-piece design consisting of:

• High-carbon iron rotor rings
• CNC-machined 6061-T6 aluminium hats
• High-strength floating hardware

This design helps reduce both:

• Unsprung weight
• Rotational mass

Resulting in improved vehicle responsiveness, steering feel and suspension performance.

Superior Cooling Performance

Each rotor ring features 72 curved internal vanes that act as a centrifugal air pump, drawing cool air through the centre of the disc and expelling heat more efficiently than conventional straight-vane designs.

Benefits include:

• Lower operating temperatures
• Improved resistance to brake fade
• Enhanced thermal stability
• Greater consistency during repeated heavy braking

Ideal for:

• Fast road driving
• Track days
• Time attack builds
• Performance street vehicles

Proprietary High-Carbon Iron Alloy

The rotor rings are manufactured from GiroDisc's specially developed high-carbon iron casting, engineered specifically for demanding performance applications.

Advantages include:

• Improved heat tolerance
• Reduced thermal stress
• Enhanced durability
• Longer service life
• Greater crack resistance under extreme use

This advanced metallurgy helps the discs maintain performance during repeated high-temperature braking cycles.

Fully Floating Motorsport Design

Each assembly utilises GiroDisc's race-proven floating hardware system, featuring:

• High-strength steel drive pins
• Belleville washers
• Spring clips
• Controlled rotor float

This allows the rotor ring to expand and contract naturally under heat while maintaining excellent pedal feel and street-friendly operation.

The result is:

• Reduced stress on braking components
• Improved thermal management
• Long-term durability
• No excessive noise associated with loose floating systems

Serviceable Rotor Design

When the rotor rings eventually reach the end of their service life, the aluminium hats can be retained and fitted with replacement rotor rings.

Replacement ring part number:

• D1-282

This significantly reduces long-term maintenance costs compared to replacing complete rotor assemblies.

Product Specifications

• GiroDisc Part Number: A1-282
• Configuration: Fully Floating 2-Piece Rotor
• Rotor Material: Proprietary High-Carbon Iron
• Hat Material: 6061-T6 Aluminium
• Hat Finish: Black Anodised
• Internal Cooling Vanes: 72 Curved Vanes
• Sold As: Pair
• Minimum Recommended Rotor Thickness: 34mm

Compatibility

Suitable for vehicles equipped with factory steel brakes.

BMW G80 M3

• BMW G80 M3
• BMW G80 M3 Competition
• BMW G80 M3 Competition xDrive

BMW G81 M3 Touring

• BMW G81 M3 Touring
• BMW G81 M3 Competition Touring

BMW G82 M4

• BMW G82 M4
• BMW G82 M4 Competition
• BMW G82 M4 Competition xDrive

BMW G83 M4 Convertible

• BMW G83 M4
• BMW G83 M4 Competition

BMW G87 M2

• BMW G87 M2

Not compatible with Carbon Ceramic Brake (CCB) equipped vehicles.

Why Choose GiroDisc?

GiroDisc is trusted worldwide by professional drivers, race teams and BMW enthusiasts for:

• Motorsport-proven engineering
• Exceptional cooling performance
• Reduced unsprung weight
• Rebuildable two-piece construction
• Outstanding durability under track conditions

Why Buy from R44 Performance?

R44 Performance supplies premium BMW braking upgrades trusted by enthusiasts worldwide.

• BMW specialists
• Genuine GiroDisc products
• Fast UK & worldwide shipping
• Expert technical support

Upgrade your braking system with the GiroDisc 2-Piece Front Brake Discs for the BMW G8X M3, M4 and G87 M2, delivering exceptional cooling performance, reduced weight and track-ready durability.

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.