Spec Clutch ST85ET Super Twin Multiplate Clutch Kit E-Trim

The Spec Clutch ST85ET Super Twin Multiplate Clutch Kit in E-Trim is engineered for high-output street and track applications, delivering reliable clutch performance in vehicles producing 700 to 1,500 ft-lbs of torque. Designed with near-stock drivability in mind, the Super Twin platform bridges the gap between daily driving comfort and all-out performance use across a wide range of motorsport disciplines.

Built entirely from billet materials, these assemblies operate smoothly and quietly while offering aircraft-grade aluminum and high-carbon billet steel construction. Components are precision-milled to an industry-leading .001-inch tolerance for perfect rotational balance and responsive clutch actuation. Friction is delivered through dampened, full-faced carbon graphite discs, and the E-Trim configuration makes this kit an ideal choice for limited street and drag race use.

Key Features:

• Designed for vehicles with 700–1,500 ft-lbs of torque
• Near-stock pedal feel and drivability
• No-shimming, no-setup required — true bolt-in installation
• Maintenance-free operation under normal use
• All-billet construction: aircraft-grade aluminum and high-carbon billet steel
• Precision-milled to .001-inch tolerances for perfect balance and actuation
• Dampened, full-faced carbon graphite friction discs
• Rebuildable by SPEC or the end user — replacement components always available
• Flywheel and track-spec hardware included
• Suitable for street, drag, drift, road racing, time attack, pulling, and rallye

All SPEC Super Twin kits are designed, hand-built, and tested in the U.S.A. The E-Trim designation identifies this kit as part of SPEC's carbon graphite full-face disc lineup, optimized for aggressive but manageable engagement in extreme-output builds. Organic, fiber, and full-metallic disc options are also available across the Super Twin platform.