Spec Clutch SB07A Aluminum Flywheel SFI Certified Billet Performance

The SPEC SB07A Aluminum Flywheel is a precision-engineered billet performance flywheel designed for competitive driving and racing applications. CNC-machined to an industry-leading .001 tolerance — ten times tighter than the industry standard of .010 — this flywheel delivers exceptional rotational balance, minimal runout, and a perfectly flat friction surface that optimizes clutch disc engagement and longevity.

Key Features:

• Aircraft-quality billet aluminum construction — tempered 6061-T6 or 2024-T3 aluminum body for maximum strength at minimum weight
• Replaceable 1/4-inch friction plate — 1050 high-carbon alloy steel, specially formulated for superior clutch bedding and holding power; compatible with all friction disc materials including iron
• SFI certified — meets SFI safety standards for competitive and high-performance environments
• Rebuildable design — friction plate is fully replaceable, extending the service life of the flywheel
• CNC machined to .001 tolerance — ensures perfect dimensional balance, eliminating vibration-causing runout for smooth, reliable engine revolutions
• Aerospace-grade fasteners — friction plate secured with aerospace fasteners or stainless steel rivets for exceptional strength and corrosion resistance
• Heat-treated ring gear — pressed-on and secured with grade-10 fasteners for long-lasting durability
• Optimized Moment of Inertia (MOI) — engineered to the correct weight for the specific application, balancing power transfer, acceleration response, and drivability

A flywheel's role in drivetrain performance is critical: it must provide a consistent friction surface for the clutch disc, contribute the correct rotating inertia for the intended use, and maintain true dimensional balance at all RPM ranges. Too much inertia slows throttle response; too little reduces drivability. SPEC engineers each flywheel to the optimal weight for the application, factoring in gear ratios, vehicle weight, power output, and powerband characteristics.

The SB07A is suited for performance street driving, road racing, autocross, drag racing, and other high-demand applications where reduced rotating mass and clutch system precision are essential. It pairs with SPEC clutch kits for a complete, performance-matched drivetrain upgrade.