The SB11-HDR4 kit pairs ACT’s Heavy Duty pressure plate with a 4-pad rigid race disc for high-performance race use. The diaphragm-style pressure plate increases clamp load, reduces deflection, and maximizes clutch life. The 4-pad rigid disc features high-quality ceramic friction material with a heat-treated chrome-moly hub for strength and durability. Engagement is aggressive for faster shifts, and the rigid design is ideal for smaller disc sizes and compact engines.

Specs

• Torque Capacity: 574 ft/lbs (86% over OE)
• Disc Material: Ceramic
• Disc Diameter: 9.4 in / 240 mm
• Input Shaft Diameter: 1 in
• Pressure Plate Type: Heavy Duty
• Product Weight: 27.1 lbs
• Flywheel Type: Streetlite

Performance Characteristics

• Feel: Light to moderate pedal effort, aggressive engagement, increased gear rattle
• Life: Moderate friction life, extended by ACT’s exclusive diaphragm design; rigid design may increase spline wear
• Quality: Precisely assembled, accurately balanced, with ceramic friction materials for high heat tolerance and maximum performance
• Recommended Use: Race use only
• ACT Difference: 100% clamp load tested, dynamically balanced for smooth high RPM reliability