GiroDisc Porsche 991 GT3, GT2RS, GT4RS PCCB Front Iron Rotor Conversion - GiroDisc A1-154
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GiroDisc Porsche 991 GT3, GT2RS, GT4RS PCCB Front Iron Rotor Conversion

GiroDisc
GIRA1-154
A1-154
Brake Rotors - 2 Piece
9 Units In Stock
$ 1,949.99
$ 1,949.99

This GiroDisc two-piece brake rotor set is engineered for the exact brake configuration shown below. Its reusable aluminum hats and replaceable cast-iron friction rings reduce service waste while preserving the factory caliper relationship when the application notes are followed.

Key Features

  • Two-Piece Construction: 6061-T6 aluminum hats reduce unsprung weight by 2.5 lbs per rotor compared to OEM while floating design eliminates hat-to-rotor fretting.
  • Curved Vane Runner: Cast iron ring with directional curved vanes pulls cooling air through rotor increasing thermal capacity by 25 percent over solid designs.
  • Direct PCCB Fitment: Matches OEM 396 x 36mm dimensions bolts into PCCB calipers using iron pads for everyday and competition braking.
  • Slotted Friction Surface: Precision slots enhance initial bite expel brake gases and sweep away pad residue for shorter stopping distances.
  • Modular Replaceable Ring: Cast iron friction ring can be swapped without new hats extending rotor life and lowering long-term costs.
  • Requires iron or metallic brake pads only pad shape does not support ceramic PCCB pads.

Fitment

Years Make Model Application
2014-2019 Porsche 911 991 GT3 or GT2 RS PCCB iron-rotor conversion
2021-2026 Porsche 911 992 GT3 PCCB rear iron-rotor application where specified
2022-2026 Porsche 718 Cayman GT4 RS PCCB iron-rotor conversion

Specifications

Brand GiroDisc
Manufacturer Part Number A1-154
Product Type Two-Piece Brake Rotor Set
Position Front
Fitment Type Vehicle specific

What's Included

The axle set, assembled hats and friction rings, and only the hardware GiroDisc supplies for this exact part number

About GiroDisc

GiroDisc designs and manufactures serviceable two-piece brake rotors, replacement rings, and related brake components in Bellingham, Washington. Selection remains exact-part-number and brake-configuration specific.

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Frequently Asked Questions

Will this fit my 2014-2019 Porsche 911?
That year, make, and model range is listed, but the exact trim, axle position, rotor dimensions, caliper, brake package, and every application note must also match.

Can I use my factory calipers and brake pads?
Many GiroDisc rotor sets retain the factory calipers, but some iron conversions require a different pad shape or compound. Follow the exact application note for this part number.

Are these rotors sold individually or as a pair?
GiroDisc commonly sells these assemblies as an axle pair, but confirm the quantity shown for this exact part number before ordering.

Installation Instructions

Follow the current GiroDisc instructions and vehicle service information. Confirm the brake package and rotor direction, clean mounting surfaces, inspect hubs and calipers, torque all fasteners to the specified values, verify clearance, and complete the required pad-bedding procedure before normal use.

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