Girodisc A2-186 Rear 370mm 2-Piece Floating Slotted Vented Rotors/Brake Discs – BMW M2 M3 M4 F80 F82 F83 F87 – Direct Fit for OEM Blue Brembo Iron Calipers – Pair Performance Upgrade

Rear 370 mm two piece floating slotted rotor set for BMW F80 M3, F82 M4, F83 M4 Convertible and F87 M2 with factory blue Brembo package | Girodisc A2-186

Transform pedal confidence and repeatable stopping power with this Girodisc rear rotor upgrade. Designed for F-series BMW M cars running the OEM blue Brembo iron brake setup, this 370 mm performance rear rotor pair delivers cooler running, sharper bite and reduced unsprung weight without any modification. It installs as a direct fit with the standard calipers and retains factory brake balance and ABS tuning for fast road and track day use.

Girodisc combines a lightweight CNC machined 6061-T6 aluminium bell with a proprietary high carbon iron ring, joined by a floating drive system that controls heat while allowing the disc to expand under heavy loads. Directional internal vanes act like a pump to move air through the rotor, and precision machined slots continuously refresh the pad face for consistent friction. The result is excellent fade resistance, improved pedal feel and long term durability. Made in the USA.

Why enthusiasts choose this rear rotor set

• Direct fit with the OEM blue Brembo rear calipers, no changes needed
• Floating two piece assembly helps reduce unsprung mass and manages heat
• Directional vanes for superior airflow and temperature control
• Slotted surfaces maintain pad health and deliver consistent bite
• Anti-rattle spring hardware keeps things quiet while allowing thermal movement
• High strength alloy steel drive pins with corrosion protection
• 12.9 grade fasteners and hardened washers for reliability
• Serviceable design so you can replace the iron rings and reuse the aluminium hats
• Sold as a matched pair for the rear axle

We run Girodisc on our own cars and have installed this A2-186 rear set for many BMW M customers. Feedback is consistently positive, with stronger stopping, repeatable performance on spirited drives and track days, and road manners that suit daily use.

Key details

• Diameter: 370 mm
• Nominal thickness: 24.0 mm
• Construction: two piece floating, vented
• Vane style: directional internal vanes
• Friction face: machined slots, zinc coated for corrosion resistance
• Materials: proprietary cast iron rings, 6061-T6 aluminium hats
• Part number: A2-186

Vehicle applications

For BMW models equipped with the factory blue Brembo iron brake package:

• BMW F80 M3 Saloon
• BMW F82 M4 Coupe
• BMW F83 M4 Convertible
• BMW F87 M2, including LCI N55

Important: Not suitable for red, silver or gold calipers, and not for carbon ceramic systems.

Perfect partner up front

Complete your setup with the matching 380 mm Girodisc front two piece rotor set for the blue Brembo package to balance heat capacity and pedal feel.

Professional fitting and support

We recommend expert installation for best results. MJ Modifications offers supply and fitting at our Warwickshire workshop. For a fitting quote or advice on your BMW M brake package, email info@mjmodifications.co.uk.

Fitment check before dispatch

We verify compatibility before shipping. At checkout, add your UK registration or the last 7 digits of your VIN so we can confirm this A2-186 rear set suits your specific car with the blue Brembo iron brakes.

Search terms our customers use

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