Spec Clutch SP86A SFI-Certified Aluminum Flywheel Billet Lightweight

The Spec Clutch SP86A is a precision-engineered, lightweight billet aluminum flywheel designed for performance driving and competitive racing applications. Manufactured to an industry-leading .001-inch machine tolerance — ten times tighter than the industry standard of .010 — this flywheel delivers exceptional rotational balance, a perfectly flat clutch bedding surface, and smooth engine revolutions that protect against power-robbing vibration. All Spec flywheels carry SFI certification, making this unit a trusted choice for sanctioned competition environments.

Key Features:

• CNC-machined from aircraft-quality billet aluminum (6061-T6 or 2024-T3 tempered alloy) for maximum strength at minimum weight
• Industry-exclusive .001-inch machining tolerance ensures perfect balance and a flat seating surface for the clutch disc
• Rebuildable design with a replaceable 1050 high-carbon alloy steel friction plate (1/4-inch thick) for long service life and compatibility with all friction disc materials
• Friction plate secured by aerospace-grade fasteners or stainless steel rivets for exceptional strength and corrosion resistance
• Heat-treated ring gear pressed on and secured with Grade 10 fasteners for maximum durability
• SFI certified for use in sanctioned racing events
• Lightweight aluminum construction reduces rotating mass for faster engine response, quicker revs, and improved acceleration

The flywheel plays a critical role in clutch system performance, providing the friction surface for the clutch disc, managing driveline inertia, and maintaining true rotational balance at all RPM levels. Compared to heavier steel flywheels, this aluminum unit dramatically reduces rotational inertia, allowing the engine to rev more freely and respond faster to throttle inputs — a measurable advantage on the track or in performance street driving.

Spec engineers invest heavily in research and development to optimize flywheel weight and moment of inertia (MOI) for specific driving and racing applications, ensuring this flywheel is precisely matched to maximize output and performance for its intended use.