Girodisc Rear Steel Disc Conversion – 390mm – Porsche 991 GT3 / GT3 RS / GT2 RS / 718 GT4 RS

By Girodisc
£1,900.00
Available – Dispatched within 3–5 Days

Replace Rear Carbon Ceramics Without Compromise

This Girodisc rear steel disc conversion kit — also referred to as iron rotors — is a direct-fit replacement for the factory 390mm PCCB (carbon ceramic) rear discs found on high-performance Porsche GT models. Whether you're saving your OEM ceramics for resale or want predictable, fade-free braking on track, this conversion delivers lasting performance and cost efficiency.

Sold/priced per pair.

Why Convert from PCCB to Steel Discs?

Ceramic discs are excellent for occasional fast road use, but steel rotors offer distinct advantages under more demanding conditions:

  • Better thermal stability for track days and competition

  • Improved brake pedal feel and control

  • Reduced long-term maintenance costs

  • Compatible with motorsport pad compounds like Ferodo DS3.12, Endless ME20/22, or PFC 08/11

🔧 Note: For optimal performance and brake balance, we strongly recommend converting front and rear discs together.

Key Features

  • 2-piece floating steel rotors

  • Lightweight, anodised 6061-T6 aluminium hats

  • Directional curved vane cooling for consistent performance

  • 390mm diameter – direct replacement for OEM PCCB rears

  • Fully CNC machined in the USA

  • Retains full compatibility with OEM yellow calipers and brake lines

  • Ideal for fast road use, endurance racing, and circuit driving

  • Once the Girodisc kit is installed, you’ll only need to replace the disc/rotor when worn. New hardware is included with replacement discs, and the aluminium bells do not require replacement.

Compatibility

  • Porsche 991.1 / 991.2 GT3

  • Porsche 991.1 / 991.2 GT3 RS

  • Porsche 991.2 GT2 RS

  • Porsche 718 Cayman GT4 RS

⚠️ Only suitable for vehicles originally equipped with PCCB rear brakes. Not compatible with models that came with steel brakes from the factory.

Front Conversion Also Available

This rear kit is designed to be used in conjunction with the matching 410mm Girodisc front conversion kit, available separately...

Girodisc Front Steel Disc Conversion – 410mm – Porsche 991 GT3 / GT3 RS / GT2 RS / 718 GT4 RS

Recommended Supporting Upgrades

  • High-friction pads (e.g. Ferodo, Endless, PFC)

  • Stainless steel brake lines

  • Motorsport brake fluid (e.g. Endless RF-650, Motul RBF 660)

  • Full Clubsport braking packages available on request

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