Spec Clutch SC98A Aluminum Flywheel SFI Certified CNC Billet

The SPEC SC98A Aluminum Flywheel is a precision-engineered, aircraft-quality billet aluminum flywheel designed to maximize clutch performance and drivetrain efficiency in demanding street and competition applications. CNC machined to an exceptional .001" tolerance — ten times tighter than the industry standard of .010" — this flywheel delivers perfect rotational balance and a perfectly flat clutch disc bedding surface right out of the box.

Key Features:

• SFI Certified — meets strict safety standards for high-performance and competitive motorsport environments
• CNC machined to .001" tolerance — far exceeding the industry standard .010", ensuring flawless balance and no dimensional runout
• Aircraft-quality billet aluminum construction — provides a lightweight option to reduce rotational mass and improve throttle response
• Replaceable steel friction plate — friction-enhancing steel surface specially formulated for optimum clutch disc bedding and holding power
• Rebuildable design — serviceable friction plate extends the service life of the flywheel
• Optimized Moment of Inertia (MOI) — SPEC-engineered flywheel weight and dimensions tuned to maximize power transfer and acceleration

The flywheel plays a critical role in clutch system performance through three functions: providing a consistent, friction-enhancing surface for the clutch disc; contributing the correct rotational inertia to match the vehicle's power output, gear ratios, and tire characteristics; and maintaining true dimensional balance at all RPM levels to eliminate vibration and protect engine components.

By reducing rotational inertia with its lightweight aluminum construction, the SPEC SC98A helps the engine rev more freely, improving acceleration response. SPEC's research-driven approach to flywheel geometry and weight ensures the MOI is optimized for your specific performance goals, whether on the street or the track.