Spec Clutch ST85PT Super Twin P-Trim Multi-Disc Clutch and Flywheel Kit

The Spec Clutch ST85PT Super Twin P-Trim is a high-performance multi-disc clutch and flywheel kit engineered for street and track use in vehicles producing extreme horsepower and torque — rated to handle 700–1,500 ft-lbs of torque. Despite its race-oriented capability, the Super Twin delivers near-stock drivability and maintenance-free operation with no shimming or setup required — simply bolt it in and go.

Built entirely from billet materials, the ST85PT features aircraft-grade aluminum and high-carbon billet steel machined to industry-leading .001-inch tolerances for perfect balance and smooth, quiet actuation. Friction is provided by dampened, full-faced carbon-graphite discs in the P-Trim configuration, which uses a 6-paddle sprung hub design for an aggressive yet streetable engagement with excellent torque capacity. The double-sprung hub with spring cover reliefs provides flexibility while heat-treated components ensure long-term strength and durability.

Key Features:

• Torque capacity: 700–1,500 ft-lbs
• P-Trim: Carbon composite, 6-paddle sprung hub disc
• Aircraft-grade aluminum and high-carbon billet steel construction
• Machined to .001-inch tolerances for perfect balance
• Dampened, full-faced carbon-graphite friction discs
• No shimming or setup required — true bolt-in installation
• 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

The SPEC Super Twin P-Trim is ideal for high-powered street or race builds that demand both serious torque handling and real-world drivability. Each kit is sold complete with flywheel and track-spec hardware, and the entire assembly is rebuildable — making it a long-term investment for any performance build.