ACT BM17-XTR4 Extreme Race Rigid Clutch Kit - 4-Pad

The ACT BM17-XTR4 is a competition-grade clutch kit built around ACT's Xtreme pressure plate and a 4-pad rigid race disc, engineered for maximum performance in demanding race applications. Featuring aggressive engagement and select ceramic friction materials for exceptional high-heat tolerance, this kit is designed for drivers who demand the fastest possible shifts over street drivability.

Xtreme Pressure Plate:

• ACT's exclusive diaphragm design increases clamp load, reduces deflection, and maximizes clutch life
• All diaphragms undergo a four-stage heat-treating process for consistent, race-ready performance
• Precision cover stampings provide rigidity and long-term consistency
• Expect a 50–80% increase in pedal effort compared to stock — characteristic of Xtreme-series pressure plates
• 100% clamp load tested and dynamically computer balanced to within 0.25 oz-in for smooth high-RPM operation

4-Pad Rigid Race Disc:

• High-quality ceramic friction materials deliver superior heat tolerance and maximum friction performance
• Chrome-moly hub is heat-treated for strength and durability
• Lightweight, rigid design enables quicker, more precise shifts
• Well-suited for smaller disc sizes used in smaller-displacement engines
• Engagement is aggressive — faster shifting with harsher take-up compared to sprung designs

Kit Notes:

• Recommended for race use only — moderate to heavy pedal effort, aggressive engagement, and increased gear rattle are expected characteristics
• Rigid disc design may increase spline wear over time
• Conversion kit: Must be used with ACT flywheel 601011 or 601016 (sold separately)
• Includes pressure plate bolts (M8-1.25 x 20mm)
• Disc spline: 1-1/8" x 10

ACT race discs typically require only a few firm clutch slips to lap in the friction surfaces before full use. For the serious competitor who needs uncompromising clutch performance, the BM17-XTR4 delivers precision-engineered reliability under the harshest race conditions.