Spec Clutch SD894 Stage 4 Performance Clutch Kit - Carbon Semi-Metallic Puck Disc

The Spec Clutch SD894 Stage 4 Clutch Kit is a high-performance racing clutch engineered for heavily modified engines demanding maximum torque transfer and instantaneous engagement. As a solid hub evolution of the Stage 3, it replaces the sprung hub with a rigid 8-rivet solid hub assembly that is heat-treated for exceptional strength and durability under extreme competition conditions.

The Stage 4 is available in 3-puck, 4-puck, or 6-puck carbon semi-metallic friction disc configurations, allowing the driver to fine-tune the setup to their specific motorsport discipline. The 3-puck disc is the lightest option for maximum weight reduction, while the 6-puck configuration offers the smoothest engagement of the three. The 4-puck serves as a balanced compromise between weight savings and engagement feel. Due to the rigid hub design, this clutch is not recommended for street use — it is purpose-built for competition environments.

Kit Includes:

• High-clamp performance pressure plate
• Carbon semi-metallic puck friction disc (3, 4, or 6-puck configuration)
• High-torque rigid solid 8-rivet hub and carrier assembly
• Release bearing
• Alignment tool kit

Recommended Motorsport Applications:

• Drag Racing
• Drift
• Road Racing
• Rallye
• Pulling
• Circle Track

The Spec SD894 Stage 4 is the ideal choice for competitors who require aggressive, instantaneous clutch engagement and reduced rotational mass in a single-disc package. Not intended for daily street driving.