Girodisc 2-piece front rotors for every application in this range, in one listing. Choose your car in the Application drop-down, then choose Full rotors with hats (complete assemblies, ready to install) or Replacement rings only if you already run Girodisc hats.
Application guide
| Application | Full rotors (pair) | Rings only (pair) | Notes |
|---|---|---|---|
| 718 Cayman GT4 RS – iron brakes | A1-291 – $1,950 | D1-291 – $1,130 | Direct replacement for the factory front rotors on the GT4 RS with the standard iron brake system. |
| 718 Cayman GT4 / Boxster Spyder – 380 mm iron | A1-066 – $1,750 | D1-066 – $1,030 | Replaces the factory 380 mm front rotors. |
| 718 Cayman GT4 / Boxster Spyder with PCCB → iron conversion | A1-156 – $1,950 | D1-154 – $1,130 | 410 mm iron conversion on the factory PCCB calipers. Use the GT3/Turbo iron-brake pad shape. |
| GT4 / GT4 RS Clubsport – Girodisc hats (380x32) | A1-266 – $1,750 | D1-238 – $1,030 | Direct replacement for the factory Clubsport 380x32 mm discs. |
| GT4 / GT4 RS Clubsport – rings for factory PFC hats (380x32) | — | D1-370 – $1,030 (factory PFC hats) | Tooth-drive rings for the factory Porsche/PFC hats; reuse factory retaining hardware. Replaces PFC 380.32.0054.451/.461. |
| 718 Cayman / Boxster GTS 4.0 – 350 mm (direct fit) | A1-032 – $1,350 | D1-032 – $880 | Direct bolt-on replacement for the factory 350 mm front rotors. |
| 981 Boxster Spyder – 340 mm, upsized to 350 mm (spacers included) | A1-122 – $1,350 | D1-122 – $880 | Slightly larger than the 340 mm factory disc; caliper spacers included. |
| 718 Cayman / Boxster S, GTS – 330 mm, upsized to 350 mm (spacers & bolts included) | A1-203 – $1,350 | D1-203 – $880 | Caliper spacers and longer bolts included. |
| 718 Cayman / Boxster base & 981 S / GTS – 330 mm, upsized to 350 mm (spacers & bolts included) | A1-153 – $1,350 | D1-153 – $880 | Caliper spacers and longer bolts included. |
| 981 Cayman / Boxster base – 315 mm, upsized to 340 mm (spacers & bolts included) | A1-035 – $1,250 | D1-031 – $780 | Caliper spacers and longer bolts included. |
| 987 Cayman S / R, 987.2 base, 986 Boxster S – 317 mm, upsized to 340 mm (spacers & bolts included) | A1-031 – $1,250 | D1-031 – $780 | Caliper spacers and longer bolts included. |
Correct fitment depends on the brake package your car left the factory with (rotor diameter, iron vs. PCCB / carbon-ceramic, caliper colour). If you are unsure, contact PHD Racing with your VIN before ordering and we will confirm the part number.
Girodisc 2-piece floating rotors
- Iron friction ring on a 6061-T6 aluminum hat – cuts unsprung and rotating weight vs. the one-piece factory disc.
- Curved, directional cooling vanes act as a centrifugal pump, pulling air through the disc under repeated hard stops.
- Pin-drive float system with anti-noise spring washers: the ring grows with heat and self-centers without the cold rattle of a race-style floating rotor.
- Rings cast from Girodisc's own high-carbon iron and machined in-house in Bellingham, WA; hats machined from US-sourced aluminum.
- Keeps the factory calipers, brake bias and ABS behaviour. Sold in pairs, directional (left/right).
- Serviceable: when the rings wear out, order the Replacement rings only variant and keep your Girodisc hats. Replacement rings fit Girodisc hats only.
Product photos are supplied by Girodisc and are representative of the product family; hat design and ring size vary by application.
