ACT BM12-HDR4 Heavy Duty Race Rigid Clutch Kit - 4-Pad

The ACT BM12-HDR4 Heavy Duty Race Rigid 4-Pad Clutch Kit is engineered for maximum performance in race applications, pairing ACT's most popular Heavy Duty pressure plate with an aggressive 4-pad rigid race disc. This kit is built for drivers who demand quick, precise shifts and the thermal durability to handle sustained high-performance use. Recommended for race use only.

Heavy Duty Pressure Plate:

• Exclusive diaphragm design increases clamp load, reduces deflection, and maximizes clutch life
• All diaphragms undergo a four-stage heat-treating process for consistent, high-performance clamping force
• Precision cover stampings deliver rigidity and dimensional consistency
• 100% clamp load tested prior to leaving the factory

4-Pad Rigid Race Disc:

• Select ceramic friction materials provide high heat tolerance and maximum performance
• Chrome-moly hub is heat-treated for strength and long-term durability
• Lightweight, rigid construction enables quicker shifts and faster gear changes
• Well-suited for smaller disc sizes found in smaller displacement engines
• Aggressive engagement character — engagement is firmer, but shifting speed is maximized
• Rigid design may increase spline wear over time; moderate friction life extended by ACT's diaphragm design

ACT Quality & Precision:

• Dynamically computer spin-balanced to within 0.25 oz-in for smooth, reliable high-RPM operation
• Carefully engineered, precisely assembled, and accurately balanced as a complete system
• Pedal effort increase of approximately 15–40% over stock (Heavy Duty rating)

Kit Note: This is a conversion kit that includes an ACT Streetlite flywheel. Use of the included ACT flywheel is required.