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

The ACT BM12-HDR4 Heavy Duty Race Rigid 4-Pad Clutch Kit is a competition-grade clutch system engineered for maximum performance under demanding race conditions. This kit pairs ACT's most popular Heavy Duty pressure plate with a 4-pad rigid race disc, delivering the aggressive engagement and rapid shift response required on the track. Recommended for race use only.

Pressure Plate Features:

• Exclusive ACT diaphragm design increases clamp load, reduces deflection, and maximizes clutch life
• All diaphragms undergo a four-stage heat-treating process for exceptional durability and consistent performance
• Precision cover stampings provide superior rigidity and consistency across all operating conditions
• 100% clamp load tested to ensure reliable holding power

4-Pad Rigid Race Disc Features:

• Select ceramic friction materials deliver high heat tolerance and maximum friction performance
• Chrome-moly hub is heat-treated for added strength and long-term durability
• Lightweight rigid design enables quicker, cleaner shifts with minimal drivetrain loss
• 4-pad configuration is ideally suited for smaller disc sizes found in smaller-displacement engines
• Aggressive engagement character — faster shifting with more pronounced engagement feel

Quality & Balancing:

• Dynamically computer spin-balanced to within 0.25 oz-in for smooth, vibration-free operation at high RPM
• Carefully engineered and precisely assembled for consistent, race-ready performance

Note: The rigid disc design may increase spline wear over time compared to sprung disc alternatives. Pedal effort will be light to moderate, with aggressive engagement characteristics and potential for increased gear rattle — traits inherent to a race-focused clutch setup. This kit is a conversion kit and includes an ACT Streetlite flywheel.