Spec Clutch SD89S Steel Flywheel High Performance CNC Machined

The SPEC SD89S is a precision-engineered steel flywheel designed for high-performance applications where reliability and balance are critical. Manufactured from high carbon billet steel, this flywheel delivers the optimal moment of inertia for improved power transfer and acceleration.

Precision Manufacturing:

SPEC flywheels are CNC machined to an extraordinary .001" tolerance—ten times tighter than the industry standard of .010". This precision ensures perfect balance and a perfectly flat bedding surface for the clutch disc, eliminating vibrations and maximizing clutch life. All SPEC flywheels carry SFI certification for competitive use.

Key Features:

• High carbon billet steel construction for durability and heat resistance
• CNC machined to .001" tolerance for perfect balance
• SFI certified for racing and competitive environments
• Friction-enhancing steel surface optimized for clutch bedding and holding power
• Rebuildable design with replaceable steel friction plate
• Engineered for specific inertia characteristics to maximize performance

Performance Benefits:

The flywheel is the most critical component for optimizing clutch performance and longevity. SPEC's steel flywheel provides consistent friction for the clutch disc, proper inertia control for power-to-acceleration ratio, and true balance at high RPM to eliminate power-robbing vibrations. The medium weight of steel construction makes it ideal for various racing applications and performance driving where both responsiveness and drivability are important.

SPEC's extensive research and development ensures each flywheel is optimized for dimensions and weight to maximize your vehicle's output across different driving conditions and racing disciplines.