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 |
|---|---|---|---|
| G80 M3 / G82 M4 / G87 M2 – iron brakes (380 mm) | A1-282 – $1,350 | D1-282 – $880 | Direct replacement for the factory 380 mm front rotors on cars without carbon-ceramic brakes. Sold in pairs. |
| G80 M3 / G82 M4 / G87 M2 – carbon-ceramic → iron conversion (400 mm) | A1-322 – $1,450 | D1-220 – $980 | Replaces the factory 400 mm carbon-ceramic front rotors with 2-piece iron while keeping the factory calipers. Use the factory iron-brake pad shape. |
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.
