ACT SB12-HDR4 Heavy Duty Race Rigid Clutch Kit - 4-Pad

The ACT SB12-HDR4 Heavy Duty Race Rigid 4-Pad Clutch Kit is engineered for high-performance applications demanding maximum torque capacity and aggressive engagement characteristics. This complete clutch kit features ACT's most popular Heavy Duty pressure plate paired with a ceramic 4-pad rigid race disc for uncompromising performance.

Heavy Duty Pressure Plate Features:

• Exclusive diaphragm design increases clamp load, reduces deflection, and maximizes clutch life
• 20 to 50 percent increase in clamp load over stock units
• Four-stage heat-treating process for unparalleled durability
• Precision cover stampings provide rigidity and consistency
• Computer spin balanced to within 0.25 oz-in for smooth high-RPM operation
• Meets SFI Specification 1.1

4-Pad Rigid Race Disc Features:

• High-quality ceramic friction materials for low wear rates and high heat tolerance
• Chrome-moly hub is heat-treated for maximum strength and durability
• Lightweight, rigid design allows for quicker shifts and trouble-free service
• All friction pads measured, sorted, and matched for uniform thickness
• Harsher engagement with faster shifting characteristics
• Ideal for smaller disc sizes in smaller engines
• SFI 1.1 certified for racing applications

Complete Kit Includes: Heavy Duty pressure plate, 4-pad rigid race disc, release bearing, pilot bearing, and alignment tool. Note: This race disc is not recommended for street use due to its aggressive engagement characteristics. Expect a 15-40% increase in pedal effort compared to stock.