Spec Clutch SB52A Tuned Billet Aluminum Flywheel SFI Certified - 1.1

The Spec Clutch SB52A is a precision-engineered, tuned billet aluminum flywheel designed for high-performance street and racing applications. Machined from aircraft-quality billet aluminum, this flywheel weighs just 10 lbs — significantly lighter than a factory steel unit — delivering faster engine revving, reduced rotating mass, and sharper throttle response.

Unlike generic lightweight flywheels, SPEC Tuned Billet Flywheels are developed and optimized for specific vehicle platforms and driving environments. Each unit is engineered to maximize the moment of inertia (MOI) for a given application, ensuring the ideal balance between performance and drivability.

Key Features:

• CNC machined to an industry-leading .001 inch tolerance (vs. the industry standard of .010 inch) for superior balance and a perfectly flat clutch seating surface
• Constructed from aircraft-quality billet aluminum for maximum strength with minimal weight
• Replaceable steel friction plate specially formulated for optimum clutch bedding and holding power — extends service life and reduces long-term cost
• SFI 1.1 certified for use in sanctioned racing and competitive environments
• Internal engine balance design
• 113-tooth ring gear for compatibility with factory starter
• Compatible with diaphragm-style pressure plates
• Race bolt kit and flange plate included

SPEC flywheels are fully rebuildable, and the replaceable friction surface means this flywheel can deliver long-term, cost-effective performance for both track and performance street use. Whether you're autocrossing, road racing, or building a dedicated performance machine, the SB52A provides the precision balance, light rotating mass, and SFI-certified safety that competitive driving demands.