Girodisc Replacement Slotted Rings/Discs for PFC V2 Rear 321mm Brake Kit

This pair of GiroDisc slotted 321x20mm rotor rings is a replacement for the friction discs on Performance Friction rear 321mm big brake kits only. With the PFC rotors discontinued, BimmerWorld partnered with Girodisc to provide a solution allowing continued service of the PFC packages utilizing these 321mm rotors. These are the cast iron rings only and you must already have the Girodisc center hat from the PFC rear Z29 BBK on E36 or E46 M3 (1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006).

This pair of left and right replacement rear brake discs does not include installation hardware. Use PFC V2 hardware for installation. See below for BimmerWorld recommended related items.

Girodisc (guy-ro) rotors are made for track/race cars as part of a two-piece disc + hat assembly. Girodisc rings are cast in the USA from their own proprietary cast iron, cadmium plated for corrosion resistance, and then painstakingly machined and balanced in the USA.

Two-piece rotors are standard equipment on race cars thanks to weight savings and improved cooling. The rotor has a curved inner vane configuration that works like a centrifugal pump to force air through the rotor. 

Girodisc has nearly 20 years of experience as a brake disc supplier to major international race teams and series. Originally manufacturing replacement rings for racing brake kits from Brembo, StopTech, and others, they now supply direct-replacement rotor upgrades for OEM brake systems. All material and components are sourced from the USA with Girodisc doing all of their machining in-house. While also offering other niche products, rotors are their primary product which guarantees excellent quality and satisfaction.

Replaces PFC part number: 321.20.0042.45, 321.20.0042.46, 321.20.0042.85, 321.20.0042.86