Spec Clutch SB80A Aluminum Flywheel SFI-Certified CNC Billet

The Spec Clutch SB80A is a billet aluminum flywheel engineered for performance driving and competition use. Machined from aircraft-quality billet aluminum — either 6061-T6 or 2024-T3 — the SB80A delivers maximum strength at the lightest possible rotating weight, helping reduce drivetrain inertia and sharpen throttle response.

What separates SPEC flywheels from the competition is their CNC manufacturing tolerance of .001" — ten times tighter than the industry-standard .010". This level of precision guarantees perfect rotational balance, zero dimensional runout, and a perfectly flat bedding surface for the clutch disc, eliminating power-robbing vibration and protecting the engine at high RPM. All SPEC flywheels carry SFI certification for use in competitive environments.

Key Features:

• Aircraft-quality billet aluminum construction (6061-T6 or 2024-T3) for ultimate strength-to-weight ratio
• CNC machined to an industry-leading .001" tolerance for perfect balance and runout-free operation
• Replaceable 1050 high-carbon alloy steel friction plate (1/4" thick) for optimum clutch bedding and holding power — compatible with all friction disc materials including iron
• Friction plate secured with 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 long-term durability
• Rebuildable design — replaceable friction plate extends service life
• SFI certified for street performance, drag, road race, drift, and autocross applications
• Optimized MOI (Moment of Inertia) reduces rotating mass and improves power transfer to the wheels

The SB80A is part of SPEC's dedicated research and development program for flywheel dimensions and weights, ensuring the optimal balance between performance, drivability, and safety for each specific application.