Spec Clutch SB29A Aluminum Flywheel SFI-Certified Billet

The Spec Clutch SB29A is a precision-engineered billet aluminum flywheel designed for high-performance street and racing applications. CNC-machined to an industry-leading .001-inch tolerance — ten times tighter than the industry standard of .010 — this flywheel delivers exceptional rotational balance and a perfectly flat clutch disc seating surface. All SPEC flywheels carry SFI certification, making them well-suited for competitive motorsport environments.

Aircraft-Grade Aluminum Construction:

• Body machined from tempered 6061-T6 or 2024-T3 aircraft-quality billet aluminum for maximum strength at minimum weight
• Aluminum flywheels are approximately half the weight of comparable stock steel units
• Replaceable 1050 high-carbon alloy steel friction plate, 1/4-inch thick, formulated for optimum clutch bedding and holding power with any friction disc material
• Friction plate secured with aerospace-grade fasteners or stainless steel rivets for exceptional strength and corrosion resistance
• Ring gear is pressed on, secured with Grade 10 fasteners, and heat-treated for long service life
• Rebuildable design with a replaceable friction plate extends overall service life
• SFI-certified for sanctioned racing applications

Performance Benefits:

• Reduced rotating mass enables faster engine revving and quicker throttle response
• Less parasitic drag on the engine improves overall power transfer to the drivetrain
• Precision balance eliminates harmful dimensional runout, protecting the engine from vibration and power loss
• Optimized Moment of Inertia (MOI) tuned through SPEC's extensive R&D process to maximize output for specific driving and racing conditions

SPEC billet flywheels are engineered and developed for specific driving environments, accounting for how each vehicle responds to changes in rotating mass. The SB29A aluminum flywheel is an excellent choice for drag racing, road racing, autocross, and spirited street driving where faster revs and reduced drivetrain inertia are priorities.