Spec Clutch SC66A-2 SFI-Certified Aluminum Flywheel with Replaceable Steel Friction Plate

The SPEC SC66A-2 is a billet aluminum flywheel CNC-machined to an industry-leading .001" tolerance — ten times tighter than the industry standard of .010". This exceptional precision ensures perfect rotational balance and a perfectly flat clutch disc bedding surface, delivering maximum performance and safety in competitive and high-performance driving environments.

Key Features:

• Aircraft-quality billet aluminum construction for reduced rotational mass and faster engine response
• CNC machined to .001" tolerance — 10× tighter than the industry standard of .010"
• SFI certified for use in sanctioned racing and competitive environments
• Rebuildable design with a replaceable steel friction plate specially formulated for optimum clutch bedding and holding power
• Precision-balanced to eliminate dimensional runout and prevent engine-damaging vibrations
• Optimized Moment of Inertia (MOI) for maximum power-to-acceleration ratio

The flywheel plays a critical role in clutch system performance. It provides the friction surface for the clutch disc, contributes to proper rotational inertia to smooth power delivery, and must maintain true balance at all RPM ranges to prevent vibration and power loss. SPEC engineers invest extensive research and development into flywheel dimensions and weight targets, ensuring each unit is optimized for its intended application — whether street performance, road racing, drag racing, or other motorsport disciplines.

The SC66A-2 aluminum flywheel offers a lightweight option that reduces rotating mass, improves throttle response, and allows the engine to rev more freely — ideal for performance builds where quick acceleration and engine responsiveness are prioritized.