Spec Clutch SV49S Steel Flywheel - Single Mass OE Dual Mass Replacement

The Spec Clutch SV49S is a high-carbon billet steel flywheel engineered as a direct replacement for the factory dual mass flywheel (DMF). Designed to accept a sprung hub clutch disc, this single-mass flywheel simplifies the drivetrain while delivering the precision and durability required for both performance street and competition use.

Key Features:

• CNC Machined to .001" Tolerance — 10x tighter than the industry standard of .010", ensuring a perfectly flat clutch disc bedding surface and flawless rotational balance
• Replaces OE Dual Mass Flywheel — Eliminates the complexity and failure points of the factory dual mass unit
• Sprung Hub Compatible — Designed specifically to work with sprung hub clutch disc assemblies for improved drivability
• High-Carbon Billet Steel Construction — Provides a medium-inertia option that balances rev response with street-friendly driveability; retains more RPM between gear changes compared to aluminum alternatives
• SFI Certified — Meets SFI safety standards for use in competitive motorsport environments
• Optimized Moment of Inertia (MOI) — Engineered to the specific application's power characteristics, gear ratios, and driving demands for maximum performance output

A flywheel's role in the drivetrain is threefold: it provides a consistent friction surface for clutch disc engagement, contributes the proper inertial mass to balance power delivery and acceleration, and must maintain true dimensional balance at all RPM to prevent vibration and power loss. The SV49S is built to excel in all three areas.

SPEC steel flywheels are rebuildable and feature a replaceable steel friction plate — a friction-enhancing alloy specially formulated for optimal clutch bedding and holding power — extending the usable service life of the unit. Whether used on the street or at the track, the SV49S delivers the precision engineering SPEC is known for.