Spec Clutch SF50ST-2 Super Twin ST-Trim Multiplate Clutch and Flywheel Kit

The SPEC SF50ST-2 Super Twin ST-Trim is a heavy-duty twin-disc clutch and flywheel kit engineered for high-output street and track builds requiring extreme torque capacity. Rated to handle 700–1,500 lb-ft of torque, the Super Twin delivers near-stock drivability without sacrificing the holding power demanded by serious performance applications. Ideal for drag racing, road racing, time attack, drifting, rallye, pulling, and street use.

Constructed entirely from aircraft-grade aluminum and high-carbon billet steel, each assembly is CNC-milled to an industry-leading .001-inch tolerance for perfect rotational balance and precise actuation. The result is a smooth, quiet operation that sets SPEC's Super Twin apart from conventional performance clutches.

Key Features:

• Torque capacity rated from 700 to 1,500 lb-ft — suitable for forced induction and extreme builds
• Dampened, full-faced carbon graphite friction discs for consistent engagement
• All-billet construction machined to .001-inch tolerance for perfect balance
• No shimming or setup required — true bolt-in installation
• Maintenance-free operation with user-rebuildable design
• Replacement components and rebuild services available directly from SPEC
• Friction material options include organic, fiber, and full metallic
• Billet flywheel and track-spec hardware included in every kit
• Manufactured in the USA to strict quality standards

The Super Twin's user-rebuildable design means long-term ownership costs remain low — SPEC and authorized service centers can rebuild the unit, or experienced end users can source replacement components directly. This kit is a complete solution, with a matched flywheel and all required hardware included out of the box.

Driving Applications: Street • Drag • Drift • Road Racing • Time Attack • Pulling • Rallye