Spec Clutch SV98A Aluminum Flywheel SFI-Certified Billet Lightweight

The Spec Clutch SV98A is a lightweight aircraft-grade billet aluminum flywheel precision-engineered for high-performance and competitive driving environments. Spec flywheels are CNC machined to an industry-leading .001 inch tolerance — ten times tighter than the industry standard of .010 — delivering a perfectly flat clutch disc seating surface and exceptional rotational balance at all RPM levels.

The flywheel plays three critical roles in drivetrain performance: providing a consistent, friction-enhancing surface for the clutch disc; managing rotational inertia to optimize the power-to-acceleration ratio; and maintaining true dimensional balance at speed to eliminate vibration and protect the engine. The SV98A addresses all three with precision-billet construction and application-specific weight optimization.

Key Features:

• Aircraft-grade billet aluminum construction for reduced rotating mass and faster engine response
• CNC machined to .001 inch tolerance — 10x tighter than the industry standard — for a perfectly flat clutch bedding surface
• Replaceable steel friction plate for extended service life and easy rebuilding
• Optimized Moment of Inertia (MOI) engineering for maximum power delivery based on application
• SFI certified for use in sanctioned racing and competitive environments
• Compatible with a wide range of performance and racing driving styles including drag, road racing, drift, rallye, autocross, and time attack

Spec billet flywheels are engineered and developed for specific driving environments and are not a one-size-fits-all solution. Each design is optimized based on how the target vehicle responds to changes in rotating mass, ensuring the ideal balance of drivability and outright performance.