Spec Clutch SV23A-2 SFI-Certified Aluminum Flywheel

The Spec Clutch SV23A-2 is a high-performance aircraft-quality billet aluminum flywheel CNC-machined to an exceptionally tight .001-inch tolerance — ten times more precise than the industry standard of .010 inches. This exacting manufacturing process delivers perfect rotational balance and a perfectly flat clutch disc bedding surface, making it an ideal choice for competitive and high-performance driving environments. The SV23A-2 carries SFI certification for use in sanctioned racing applications.

Key Features:

• Aircraft-quality billet aluminum construction for a lightweight, high-strength build
• CNC-machined to .001-inch tolerance — 10x tighter than industry standard
• Replaceable steel friction plate made from friction-enhancing steel specially formulated for optimum clutch bedding and holding power
• Rebuildable design extends service life and reduces long-term cost
• SFI certified for sanctioned racing and competitive environments
• Optimized Moment of Inertia (MOI) engineered by Spec's R&D team to maximize power transfer and performance
• Eliminates harmful dimensional runout that causes engine-damaging vibrations and power loss

The flywheel plays a critical three-part role in drivetrain performance: it provides a consistent friction surface for the clutch disc, contributes to proper rotational inertia to balance power delivery and acceleration, and maintains true rotational balance at all RPM levels. The lightweight aluminum construction of the SV23A-2 reduces overall drivetrain inertia, allowing the engine to rev more freely — a significant advantage in performance and racing applications where throttle response is critical.

Spec engineers invest heavily in research and development to dial in the precise flywheel dimensions and weight for each application, ensuring the SV23A-2 delivers the optimal MOI for your specific combination of gear ratio, tire type, vehicle weight, and power output. Paired with a compatible Spec clutch kit, this flywheel delivers a complete, balanced performance clutch system.