Spec Clutch SB07S Billet Steel Flywheel SFI Certified

The Spec Clutch SB07S is a high-carbon billet steel flywheel engineered for street-performance and racing applications. CNC-machined to an industry-leading .001-inch tolerance—ten times tighter than the industry standard of .010—it delivers a perfectly flat clutch bedding surface and zero-compromise rotational balance, reducing vibration and protecting your engine at high rpm.

Key Features:

• SFI Certified: Exceeds SFI safety standards for high-rpm racing use
• High-Carbon Billet Steel Construction: Machined from premium steel for maximum strength and durability
• .001" CNC Tolerance: Guarantees a flat seating surface and true rotational balance with minimal runout
• Rebuildable Design: Features a replaceable friction plate formulated for optimum clutch bedding and holding power
• 20 lb. Flywheel Weight: Medium-inertia steel construction provides smoother street manners and less RPM drop during shifts compared to aluminum alternatives
• Precision Ground Crank Mating Surface: Minimizes runout for smooth, vibration-free engine revolutions
• Recommended for: Heavier vehicles, drag racing applications, and mildly modified street/strip builds

SPEC billet steel flywheels are designed as direct replacements for OEM cast steel flywheels in high-performance street and competition environments. The steel construction offers better NVH (noise, vibration, and harshness) damping characteristics than aluminum, making it an excellent choice for drivers who split time between the track and the street. Pair with any SPEC Stage 1 through Stage 5 clutch kit for a fully optimized drivetrain upgrade.