The ACT ZM2-HDR4 kit pairs ACT's most popular Heavy Duty pressure plate with a 4-pad rigid race disc for the 1990-2005 Mazda Miata. The Heavy Duty pressure plate uses ACT's exclusive diaphragm design to increase clamp load and reduce deflection, with every diaphragm undergoing a four-stage heat-treating process and precision cover stampings for rigidity and consistency. The 4-pad rigid race disc uses high-quality ceramic friction material on a heat-treated chrome-moly hub for strength and durability. Engagement is harsher than a street disc, but shifting is quicker, and the lightweight rigid design is well-suited to the Miata's smaller clutch size.
WarrantyInstallation Instructions
Specifications:
- Pressure Plate: ACT Heavy Duty, four-stage heat-treated diaphragm
- Disc Type: 4-pad rigid race disc
- Disc Friction Material: High-quality ceramic
- Hub: Heat-treated chrome-moly
- Engagement: Harsher engagement, quicker shifting
- Recommended Use: Street and race use
- Warranty: 1-year ACT limited warranty
- Part Number: ACTZM2-HDR4
Vehicle Applications:
- 1990 Mazda Miata Base
- 1991 Mazda Miata Base
- 1991 Mazda Miata SE
- 1992 Mazda Miata Base
- 1993 Mazda Miata Base
- 1993 Mazda Miata LE
- 1994 Mazda Miata Base
- 1994 Mazda Miata M Edition
- 1995 Mazda Miata Base
- 1995 Mazda Miata M Edition
- 1996 Mazda Miata Base
- 1996 Mazda Miata M Edition
- 1997 Mazda Miata Base
- 1997 Mazda Miata M Edition
- 1997 Mazda Miata STO
- 1999 Mazda Miata 10th Anniversary
- 1999 Mazda Miata Base
- 2000 Mazda Miata Base
- 2000 Mazda Miata LS
- 2000 Mazda Miata SE
- 2001 Mazda Miata Base
- 2001 Mazda Miata LS
- 2001 Mazda Miata SE
- 2002 Mazda Miata Base
- 2002 Mazda Miata LS
- 2002 Mazda Miata SE
- 2003 Mazda Miata Base
- 2003 Mazda Miata LS
- 2003 Mazda Miata SE
- 2003 Mazda Miata Shinsen
- 2004 Mazda Miata Base
- 2004 Mazda Miata LS
- 2004 Mazda Miata Mazdaspeed
- 2005 Mazda Miata Base
- 2005 Mazda Miata LS
- 2005 Mazda Miata Mazdaspeed
Warning: This product can expose you to chemicals including carbon black, glass wool fibers, or silica (in clutch discs), chromium and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov
FAQ
What's included in the ACT ZM2-HDR4 kit?
The kit includes ACT's Heavy Duty pressure plate and a 4-pad rigid race disc, sized for the Mazda Miata's clutch platform.
Is a rigid disc harder to drive on the street than a sprung disc?
Yes. A rigid-hub disc like the 4-pad race disc in this kit engages harsher than a sprung-hub street disc, but it shifts faster and is more durable for repeated hard use.
What is the pressure plate's clamp load benefit?
ACT's Heavy Duty pressure plate uses an exclusive diaphragm design to increase clamp load and reduce deflection versus a stock pressure plate, extending clutch life under harder use.
Does this kit fit the 1999 10th Anniversary Miata?
Yes, along with Base, LE, LS, M Edition, Mazdaspeed, SE, Shinsen, and STO trims spanning 1990-2005. See the full Vehicle Applications list above to confirm the exact year and trim.
