GiroDisc A2-220 380 mm 2-Piece Rear Rotors for 2013-2021 BMW M2 / M3 / M4

Vehicle Fitment

• 2013-2021 BMW M4 (F82 / F83; includes Coupe, Convertible, CS, GTS - rear axle)
• 2014-2021 BMW M3 (F80 / LCI F80 - S55 3.0 L Twin-Turbo, rear axle)
• 2016-2021 BMW M2 (F87 / G87, including M2 Competition & M2 CS - rear axle)

Features

• 2-piece floating rotor design - 6061-T6 aluminum hat + proprietary cast-iron rotor ring to reduce unsprung & rotational mass
• 380 mm vented & slotted disc surface to improve cooling, pad-gas/debris purge, and fade resistance under high-load or repeated braking
• Curved-vane internal ventilation - acts like a centrifugal "pump" to draw cooling air through the rotor under braking for superior heat dissipation
• Floating-mount hardware (cadmium-plated alloy-steel drive pins + anti-noise spring washers) - accommodates thermal expansion, self-centers the rotor, and eliminates cold-start rattle common in fixed rotors
• Direct bolt-on replacement - installs onto OEM hubs and fits factory calipers (including cars with original carbon-ceramic or iron rear brake setup) with no modifications required
• Reusable-hat design - when cast-iron rings wear below service limit, only rings need replacement; aluminum hats remain reusable, reducing long-term maintenance cost
• Reduced unsprung and rotational weight vs OEM rotors - can improve suspension response, braking modulation and overall handling dynamics
• Maintains factory brake bias and ABS calibration - ideal for converting from carbon-ceramic to iron rotors without sacrificing OEM brake balance

Specifications

• Part Number: A2-220
• Rotor Diameter: 380 mm
• Construction: 2-Piece Floating - 6061-T6 aluminum hat + proprietary cast-iron rotor ring
• Disc Surface: Slotted & vented, curved-vane ventilation
• Mounting: Floating-mount with steel drive pins, anti-noise spring washers, hardened cap screws
• Sold As: Pair (rear left + right), including all floating-mount hardware
• Supplied as Rear rotor set - for rear axle only

Included Components

• 2x Rear brake rotors (left + right) - 380 mm, 2-piece floating, slotted & vented
• Floating-mount hardware - steel drive-pins, anti-noise washers, cap screws/bolts as needed

Product Description

The GiroDisc A2-220 380 mm Rear Rotor set is a direct-fit performance upgrade designed for BMW M-series cars - specifically the M2 (F87/G87), M3 (F80), and M4 (F82/F83) built between 2013 and 2021. Whether your car came with stock iron rotors or carbon-ceramic OEM brakes, A2-220 bolts directly to the existing hubs and works with factory calipers, offering a simple, bolt-on brake upgrade. The 2-piece floating design - aluminum hat plus iron rotor ring - significantly reduces unsprung and rotational mass compared to heavyweight stock rotors, which helps improve braking response, suspension feel and overall driving dynamics.

With a slotted and vented rotor surface plus racing-inspired curved-vane internal ventilation, A2-220 delivers excellent cooling and pad-gas/debris purge even under intense braking or track-style driving. The floating-mount hardware permits thermal expansion while self-centering the rotor, and anti-noise washers prevent cold-start rattles - addressing common drawbacks of fixed or non-floating discs. Because the rotor ring is replaceable when worn, but the aluminum hat remains reusable, long-term maintenance becomes more convenient and cost-effective. For M-series drivers seeking improved braking consistency, reduced thermal fade, and a durable yet track-capable rear rotor upgrade - GiroDisc A2-220 provides a balanced, OEM-compatible solution.