Spec Clutch SF82S Steel Flywheel SFI-Certified CNC Billet

The Spec Clutch SF82S is a high-carbon billet steel flywheel engineered to deliver precision balance, optimized inertia, and maximum clutch performance for performance and racing applications. CNC-machined to an extraordinary .001-inch tolerance—ten times tighter than the industry standard of .010—this flywheel ensures a perfectly flat bedding surface and flawless rotational balance, reducing vibration and protecting your drivetrain at high RPM.

Key Features:

• SFI Certified — meets stringent safety standards for competitive and motorsport environments
• CNC machined to .001" tolerance — ten times more precise than the industry standard, ensuring perfect balance and a flat clutch disc mating surface
• High-carbon billet steel construction — provides durability and optimal inertia characteristics for performance driving and racing
• Replaceable steel friction plate — friction-enhancing surface formulated for superior clutch bedding and holding power, making the flywheel rebuildable
• Zero dimensional runout — eliminates engine-damaging vibrations and power-robbing harmonics for smooth, consistent power delivery
• Optimized Moment of Inertia (MOI) — engineered weight and dimensions are carefully developed by Spec to maximize vehicle output across a range of driving and racing applications

The flywheel plays a critical role in clutch performance by providing a consistent friction surface, managing rotational inertia for proper power-to-acceleration ratios, and maintaining true balance at all engine speeds. The SF82S steel flywheel offers a medium-weight inertia option, making it well-suited for a broad range of performance builds where durability and precise power transfer are essential.