Spec Clutch SV21S Steel Flywheel

The Spec Clutch SV21S Steel Flywheel is precision-engineered for serious performance applications where reliability and balance are critical. Manufactured from high carbon billet steel using CNC machining to an exceptional .001" tolerance—ten times tighter than the industry standard of .010"—this flywheel ensures perfect balance and a flawlessly flat bedding surface for optimal clutch disc contact and power transfer.

Key Features:

• CNC machined from high carbon billet steel to .001" tolerance for perfect balance
• SFI certified for competitive racing safety
• Precision-ground friction surface for consistent clutch engagement and enhanced holding power
• Engineered inertia characteristics optimized for improved acceleration and power delivery
• Zero dimensional runout eliminates power-robbing vibrations
• Rebuildable design with replaceable friction plate for extended service life

The flywheel plays three critical roles in clutch performance: providing a friction-enhancing surface for the clutch disc, controlling inertia to optimize the power-to-acceleration ratio, and maintaining true balance at high RPM to prevent damaging vibrations. Spec's precision manufacturing process and optimized weight distribution deliver measurable improvements in drivability, power transfer efficiency, and component longevity across all types of racing and performance driving.