Spec Clutch SU30S Steel Flywheel SFI Certified CNC Billet

The Spec Clutch SU30S is a high carbon billet steel flywheel CNC machined to an industry-leading .001" tolerance — ten times tighter than the industry standard of .010". This exceptional precision delivers perfect rotational balance and a perfectly flat clutch disc bedding surface, both critical for maximum performance and safety in competitive driving environments. The SU30S carries SFI certification, making it suitable for sanctioned racing applications.

Key Features:

• CNC machined to .001" tolerance — 10x tighter than the industry standard .010"
• SFI certified for use in sanctioned racing and competitive environments
• High carbon billet steel construction for durability and consistent friction surface
• 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
• Zero dimensional runout eliminates engine-damaging vibrations and power loss
• Optimized MOI (Moment of Inertia) — weight and dimensions engineered for specific inertia requirements to maximize power output and acceleration

The flywheel is the single most important component for optimizing clutch performance and longevity. It serves three critical functions: providing a consistent friction surface for the clutch disc, contributing the correct inertia to manage the power-to-acceleration ratio, and maintaining true rotational balance at all RPM levels. Spec engineers invest significant R&D into flywheel dimensions and weights to dial in the ideal moment of inertia for street performance and racing applications alike.