Spec ST63SST-2 Super Twin SS-Trim Multi-Disc Clutch and Flywheel Kit

The Spec ST63SST-2 Super Twin SS-Trim is a high-performance twin-disc clutch and flywheel kit engineered for street and track applications in builds producing extreme horsepower and torque. Rated to handle 700–1,500 ft-lbs of torque (900 ft-lbs for this application), the Super Twin delivers the holding power demanded by heavily modified and turbocharged platforms without sacrificing everyday usability.

Despite its race-bred capability, the Super Twin is designed to provide near-stock drivability with smooth, quiet operation—a direct result of its all-billet construction. The assembly is machined from aircraft-grade aluminum and high-carbon billet steel, milled to industry-leading .001-inch tolerances for perfect balance and precise actuation. Friction is supplied by dampened, full-faced carbon-graphite composite discs featuring a sprung hub design for smooth engagement.

Key Features:

• Torque capacity: 700–1,500 ft-lbs (900 ft-lbs rated for this application)
• Twin-disc, full-face carbon composite / Kevlar® friction discs with sprung hub
• All-billet construction — aircraft-grade aluminum and high-carbon billet steel
• Machined to .001-inch tolerances for superior balance and actuation
• No shimming or setup required — direct bolt-in installation
• Maintenance-free operation under normal use
• Fully rebuildable by SPEC or the end user; replacement components always available
• Billet steel flywheel and track-spec hardware included
• SFI Approved
• Organic, fiber, and full-metallic friction disc options available

Intended Use: Street, drag racing, drift, road racing, time attack, rallye, and pulling.

The Super Twin's infinitely rebuildable design means this is a long-term investment in your drivetrain. Whether building for street/strip, time attack, or all-out competition, the SPEC Super Twin SS-Trim delivers the reliability and performance required at the highest levels of motorsport.