The disc is made from cast iron, constructed in the USA and is made to the same specification and material as used by professional racing organizations.It is a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc.

The central hat section of our rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminum. The disc is made from our own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc.

The rotor and hat have a floating mount system, which utilizes 12 high strength alloy steel drive pins, manufactured by Girodisc in the USA to our own specifications and cadmium plated for a long lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The pins are secured by class 12.9 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self center between the pads.

Once the Girodisc system is in place, simply replace the cast iron rotor when needed.

Sold/priced per pair.

For the corresponding front brake discs, please see Girodisc BMW F80 F82 F83 F87 Front 400mm 2-Piece Brake Discs - Pair (M2 Competition, M3 & M4).

Specifications

• OEM Disc Diameter (mm) 380,0
  
• Disc Diameter (mm) 380,0
  
• Disc Finish Slotted & Zinc Coated
  
• Disc Height (mm) 64,9
  
• Disc Contruction 2-Piece Floating
  
• Max Thickness 28,0
  
• Min Thickness 26,0
  
• Disc Vane Style Curved Vane
  
• Disc Type Vented
  
• Disc Quality Premium
  
• Material Cast Iron

• BMW M Series F80 M3 Saloon S55 (2012-2015)
• BMW M Series F80 LCI M3 Saloon S55 (2015-2018)
• BMW M Series F82 M4 Coupe S55 (2013-2017)
• BMW M Series F82 M4 GTS Coupe S55 (2013-2017)
• BMW M Series F82 LCI M4 Coupe S55 (2016-2019)
• BMW M Series F82 LCI M4 CS Coupe S55 (2016-2019)
• BMW M Series F83 M4 Convertible S55 (2013-2017)
• BMW M Series F83 LCI M4 Convertible S55 (2016-2019)
• BMW M Series F87 LCI M2 N55 (2016+)
• BMW M Series F87 LCI M2 Competition S55 (2016+)
• BMW M Series F87 LCI M2 CS S55 (2018+) 

Please Note:

Suitable with red or silver calipers. Also compatible with CS models with the optional carbon-ceramic brake package (gold calipers).

Not suitable for models with blue Brembo calipers as they require different size discs.

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout. 

A2-220

Manufactured by

Girodisc