Girodisc A2-220 Rear 380mm 2-Piece Floating Slotted Brake Discs/Rotors (Pair) for BMW F80 M3, F82/F83 M4, F87 M2 Competition/CS

Rear 380 mm 2-piece floating slotted rotor upgrade for BMW F8X M cars

Unlock sharper braking, cooler operating temps and repeatable performance with this premium 2-piece rear rotor set from Girodisc. Engineered for the F8X platform with S55 power, the A2-220 kit replaces the factory 380 mm rear discs on the F80 M3, F82 M4, F83 M4 Convertible and F87 M2 Competition and CS. If you drive fast road, spirited B-road or track days, this is the rear brake upgrade that keeps pedal feel consistent and fade at bay while reducing unsprung mass.

Part number: A2-220 - sold as a matched pair for the rear axle.

Why enthusiasts choose this set

• True 2-piece design with a lightweight 6061-T6 aluminium hat and a high-carbon cast iron ring for quicker heat recovery and crisp modulation.
• Floating hardware allows axial and radial movement so the rotor self-centres between pads, improving bite and reducing judder as temperatures climb.
• Curved internal vanes act like a centrifugal pump to draw cooling air through the disc for better heat rejection and reduced fade on repeated heavy stops.
• Precision machined slotted faces help de-gas pads and maintain a clean, even contact patch. Zinc plating adds corrosion protection.
• Twelve high-strength drive pins with cadmium plating, class 12.9 fasteners and dedicated anti-noise spring washers for reliable, quiet operation when cold.
• Serviceable assembly - when the rings are worn, keep the hats and simply fit new rings. Lower long-term running costs versus one-piece discs.
• Direct bolt-on fit for the OE 380 mm rear setup. No additional brackets or lines needed.

Technical details

• Diameter: 380.0 mm
• New thickness: 28.0 mm
• Minimum thickness: 26.0 mm
• Overall height: 64.9 mm
• Construction: 2-piece floating, vented, curved vane
• Rotor ring: proprietary cast iron
• Bell/hat: 6061-T6 aluminium
• Finish: slotted faces, zinc plated
• Manufactured by Girodisc, USA

Fitment

• BMW F80 M3 Saloon, S55
• BMW F82 M4 Coupé, including LCI, CS and GTS
• BMW F83 M4 Convertible, including LCI
• BMW F87 M2 Competition, S55
• BMW F87 M2 CS, S55

Note: Suitable with red or silver calipers. Also compatible with CS and GTS models specified with the optional carbon-ceramic brake package with gold calipers. Not suitable for models with blue Brembo calipers which use a different rear disc size.

Real-world results

We have run this Girodisc rear setup on our own builds and customer cars with outstanding feedback. Drivers report stronger pedal confidence, stable braking on hot laps and impressive durability in mixed road and track use.

Installation and support

Professional fitting available at MJ Modifications in Warwickshire. For a quote or to book, email info@mjmodifications.co.uk. We recommend pairing these rears with matching Girodisc fronts for balanced brake torque and thermal capacity across the axle set.

Order accuracy

We will verify fitment before dispatch. Please provide your UK registration or the last 7 digits of your VIN at checkout to confirm compatibility with your F80, F82, F83 or F87 M2 Competition/CS.

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