Spec Clutch SF50SST-2 Super Twin SS-Trim Twin-Disc Clutch and Flywheel Kit

The Spec Clutch SF50SST-2 Super Twin SS-Trim is a high-performance twin-disc clutch and flywheel kit engineered for extreme street and track use. Rated to handle between 700 and 1,500 ft-lbs of torque, this kit is purpose-built for high-horsepower builds that demand both aggressive capability and near-stock daily drivability. The SS-Trim configuration uses dampened, full-faced carbon graphite friction discs, delivering smooth, consistent engagement across a wide range of driving conditions.

Despite its race-grade credentials, the Super Twin is designed for straightforward installation — no shimming or setup required. The bolt-in design eliminates guesswork and makes fitment direct and repeatable. The system is fully maintenance-free under normal operation, yet remains completely rebuildable by SPEC or by the end user, with replacement components and rebuild services always available.

Construction & Materials:

• Aircraft-grade aluminum and high-carbon billet steel throughout
• CNC-milled to an industry-leading .001-inch tolerance for perfect balance and actuation
• All-billet construction for smooth, quiet, vibration-free operation
• Dampened, full-faced carbon graphite friction discs (SS-Trim)
• Optional disc materials available: organic, fiber, and full metallic

What's Included:

• High-clamp twin-disc pressure plate assembly
• Disc assembly with sprung hub
• Matching billet aluminum flywheel
• Track-spec hardware

Spline Options:

• Standard spline hub (included)
• Optional 1-1/8 x 26 specialty spline input shaft available for use with TKO, GForce, T56 Mag, Hewland, XTrac, and other performance transmissions

Supported Driving Applications: Street, drag, drift, road racing, time attack, pulling, and rallye.

The SF50SST-2 carries a torque capacity rating of 1,010 ft-lbs in SS-Trim configuration, making it an ideal solution for forced-induction and high-output naturally aspirated builds that have outgrown single-disc clutch options. Each kit includes a SPEC 120-day limited warranty covering defects in materials and workmanship.