Spec Clutch SB30A Aluminum Flywheel SFI-Certified CNC Billet

The SPEC SB30A Aluminum Flywheel is a high-performance, aircraft-quality billet aluminum flywheel engineered for precision, balance, and maximum clutch performance in both street and competition applications. CNC machined to an industry-leading .001" tolerance—ten times tighter than the industry standard of .010"—this flywheel delivers a perfectly flat clutch disc bedding surface and flawless rotational balance.

Key Features:

• SFI Certified — meets stringent safety standards for competitive and motorsport environments
• CNC Manufactured to an exceptional .001" tolerance for perfect dimensional accuracy
• Aircraft-Quality Billet Aluminum construction for a lightweight, reduced-inertia design
• 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 ownership costs
• Optimized MOI (Moment of Inertia) — SPEC-engineered flywheel weight and dimensions tuned to maximize power transfer and throttle response
• Precision balance eliminates dimensional runout, preventing engine-damaging vibrations and power loss

The flywheel plays a critical role in overall drivetrain performance, influencing clutch engagement consistency, inertia management, and rotational balance. SPEC's aluminum flywheels are designed with extensive R&D to optimize moment of inertia for specific driving and racing applications—helping maximize acceleration, improve rev response, and enhance overall vehicle output. The replaceable friction plate ensures the unit can be serviced and rebuilt rather than replaced, making it a cost-effective long-term performance upgrade.