These GiroDisc 2-piece rotors are a direct replacement for the E46 M3 345mm rotor found on Competition Package (ZCP) and CSL models. Weighing in at 17.5 lbs per rotor versus 19 lbs per factory rotor, these fully floating assemblies help shed unsprung weight and rotating mass from the front axle of the vehicle. The rotor rings are machined from a proprietary casting made of high-carbon steel formulated to GiroDisc's specifications. This superior metallurgy results in a rotor that holds up better, and the 48 curved vanes act as a centrifugal pump pulling air in through the hub to effectively cool the rotors under hard use.
Features
- The 2-piece design means a reusable hat which can be attached to new rings (part number D1-012) when they need to be replaced
- All major components including the hats, rotor rings, and drive pins are manufactured in-house at our facility in Bellingham, WA from domestically sourced materials
- The hat is made from 6061-T6 aluminum and coated in a black anodize finish
- The drive pins are made from a high-strength steel alloy and cadmium-plated for corrosion resistance
- All rotors are assembled with spring clips and Belleville washers for race-ready float while also being street-friendly with no noise from loose hardware
Specifications
- Brand: Girodisc
- Product Type: Brake Rotors
- Part Number: A1-012
Vehicle Compatibility: 3 applications across 1 make. Select a make to view.
BMW (3)
| Model | Variant | Engine | Years |
|---|---|---|---|
| E46 M3, Z4M | All / Factory calipers | Front axle | |
| E46 M3, Z4M | All / Megane RS front calipers | Front axle | |
| E46 M3, Z4M | All / Porsche 986/996 calipers | Front axle |
Please confirm fitment against your vehicle before ordering. Contact us if you need help selecting the right part.