Spec Clutch SC66SST Super Twin SS-Trim Multi-Disc Clutch and Flywheel Kit

The Spec Clutch SC66SST Super Twin SS-Trim is a high-performance dual-disc clutch and flywheel kit engineered for street and track use in vehicles producing extreme horsepower and torque. Rated to handle 700 to 1,500 lb-ft of torque, this multi-plate assembly is purpose-built for demanding applications including drag racing, road racing, drifting, time attack, pulling, and rallye competition — while still maintaining near-stock drivability on the street.

The Super Twin platform features all-billet construction using aircraft-grade aluminum and high-carbon billet steel machined to an industry-leading .001-inch tolerance for perfect balance and smooth actuation. Friction is delivered through dampened, full-faced carbon-graphite/carbon composite Kevlar discs measuring 241mm (9.500 in.) in diameter with a full-face disc style and sprung hub configuration. The included billet steel flywheel is SFI-approved and precision-matched to the clutch assembly.

Key Features:

• Dual-disc (Super Twin) multi-plate design rated for 700–1,500 lb-ft torque
• SS-Trim: Carbon composite / Kevlar full-face disc material
• Disc diameter: 241mm / 9.500 inches
• Aircraft-grade aluminum and high-carbon billet steel construction
• Machined to .001-inch tolerance for perfect balance and actuation
• Dampened, full-faced carbon-graphite discs with sprung hub
• Billet steel flywheel included — SFI approved
• Track-spec hardware included
• No shimming or setup required — bolt-in installation
• Rebuildable by SPEC or the end user; replacement components available
• Suitable for street, drag, drift, road racing, time attack, pulling, and rallye

Every SPEC clutch kit and flywheel carries SFI certification, ensuring compliance with sanctioned racing standards. The Super Twin's maintenance-free operation and bolt-in fitment make it an ideal upgrade for high-horsepower builds that demand race-proven reliability without sacrificing everyday driveability.