The Girodisc PCCB Rear Iron Rotor Conversion is a 2-piece floating rotor system engineered specifically for Porsche 991 GT3, GT3 RS, and GT2 RS models equipped with factory PCCB brakes. Designed to complement the front conversion, this setup replaces fragile and costly carbon-ceramic rear rotors with high-performance cast iron discs and lightweight aluminum hats, delivering improved thermal stability, consistent braking performance, and drastically reduced operating costs. Ideal for track-focused builds and aggressive street use, it maintains factory brake balance while significantly increasing serviceability.
Fits Porsche 991.1 / 991.2 GT3, GT3 RS, GT2 RS with factory PCCB
Designed as a direct replacement for rear PCCB rotors — no modification required
Must be paired with iron-compatible rear brake pads (not PCCB pads)
Fully compatible with OEM calipers, ABS, and brake bias
Recommended to run alongside matching Girodisc front conversion for optimal balance
Pair of 2-piece rear floating rotors (left & right)
CNC-machined 6061-T6 aluminum rotor hats (pre-assembled)
High-strength drive pins and floating hardware
Anti-rattle / anti-noise hardware components
Rotor type: 2-piece floating iron rotor conversion (rear axle)
Rotor material: High-carbon cast iron alloy
Hat material: 6061-T6 billet aluminum
Cooling design: Directional curved vane internal cooling
Mounting system: Floating rotor design with precision drive pins
Rotor sizing: Matches OEM PCCB rear dimensions (~390mm class)
Serviceability: Replaceable rotor rings (reuse hats for future service)
Sold as: Rear axle pair
Complete PCCB conversion solution: Rear system pairs with front kit for full iron brake setup
Superior heat dissipation: Iron construction and vane design improve cooling under repeated braking
Consistent pedal feel: Eliminates variability and heat sensitivity common with ceramic rotors on track
Floating rotor architecture: Reduces stress, prevents cracking, and improves long-term durability
Lower cost of ownership: Replace rings instead of full rotor assemblies — massive savings over PCCB
Expanded pad selection: Unlocks access to true motorsport pad compounds for track performance
OEM system compatibility: Retains factory calipers, ABS calibration, and brake bias
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