D1-103 Girodisc Porsche 964, 993 Front Replacement Rings
Restore classic Porsche braking precision with Girodisc D1-103 322mm front replacement rings. These performance-engineered rotors bolt directly to your existing Girodisc aluminum hats using the included floating hardware kit. Machined from Girodisc’s proprietary high-carbon cast iron, they provide superior heat management, reduced fade, and consistent pedal feel — ideal for spirited road driving or vintage racing applications.
Vehicle Fitment
Compatible with:
• Porsche 964 Carrera 2 / Carrera 4 (1989–1994)
• Porsche 993 Carrera / Carrera S / Carrera 4S (1995–1998)
Note: Designed exclusively for Girodisc 322mm two-piece front rotor systems. Not compatible with OEM one-piece or carbon-ceramic discs.
Features
• Sold as a left/right pair with full floating hardware kit
• Direct replacements for Girodisc 322mm two-piece front rotors
• CNC-machined from high-carbon cast iron for exceptional thermal stability
• Directional curved vanes promote airflow and reduce heat buildup
• Maintains factory brake balance, ABS, and stability control calibration
• Precision-balanced for smooth, vibration-free performance
• Designed exclusively for Girodisc aluminum hats
Specifications
• Diameter: 322 mm
• Position: Front
• Material: High-carbon cast iron
• Mount type: Floating two-piece system
• Includes: Two rotor rings and complete hardware kit
• Sold/priced per pair
Girodisc D1-103 Porsche 964, 993 Front Ring FAQs
Will these fit OEM Porsche rotor hats? No. The D1-103 rings are designed exclusively for Girodisc aluminum hats and cannot mount to factory one-piece or carbon-ceramic systems.
What pad compounds are recommended? For dual street/track driving, Pagid RS29 or Ferodo DS2500 offer excellent performance. For full racing, Pagid RSL1 or Endless ME20 provide consistent friction and heat control.
Do these rotors improve cooling compared to OEM? Yes. The directional curved vane design channels air through the disc for more efficient cooling, reducing fade during repeated hard stops.
What torque should be used for hardware installation? Torque each bolt to 12 ft-lbs (16 Nm) using blue Loctite, and verify torque after one complete heat cycle for proper float and safety.
Upgrade your air-cooled Porsche’s braking system with Girodisc D1-103 322mm front replacement rings — precision-built for balance, durability, and consistent stopping power on road or track.
