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Complete Clutch and Flywheel Upgrade Engineered for the 2019-2025 Mazda MX-5 Miata
The ACT ZM14-HDSS delivers a meaningful performance upgrade for the 2019-2025 Mazda MX-5 Miata, pairing ACT's most popular Heavy Duty pressure plate with the Performance Street organic disc and a precision flywheel in a complete, ready-to-install kit. The Heavy Duty pressure plate significantly increases clamp load over the factory unit while the Performance Street organic disc with its sprung hub maintains smooth, predictable engagement for daily driving and track day use. The ACT ZM14-HDSS is engineered specifically for the ND2 platform MX-5 Miata including the Sport, Club, Grand Touring, RF Club, and RF Grand Touring trims, offering an upgrade that supports modified power levels and spirited driving without sacrificing the light, communicative clutch feel that makes the Miata rewarding to drive.
Key Features
- ACT ZM14-HDSS uses the Heavy Duty pressure plate for increased clamp load and torque capacity over the factory unit
- Performance Street organic disc with sprung hub delivers smooth, progressive engagement for street and track use
- Proprietary ACT diaphragm design with four-stage heat-treating process for maximum durability under hard use
- Precision cover stampings provide consistent rigidity and performance across all operating conditions
- Premium organic disc materials with high copper content improve heat transfer and burst strength
- Reduced disc marcel for faster shift action without sacrificing engagement smoothness
- Fits 2019-2025 Mazda MX-5 Miata including Sport, Club, Grand Touring, RF Club, and RF Grand Touring trims
- Complete kit with all required hardware for direct installation
- Backed by ACT limited warranty
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2019-2025 | Mazda | MX-5 Miata | Sport |
| 2019-2025 | Mazda | MX-5 Miata | Club |
| 2019-2025 | Mazda | MX-5 Miata | Grand Touring |
| 2019-2025 | Mazda | MX-5 Miata | RF Club |
| 2019-2025 | Mazda | MX-5 Miata | RF Grand Touring |
| 2020 | Mazda | MX-5 Miata | 100th Anniversary Special Edition |
| 2020 | Mazda | MX-5 Miata | RF 100th Anniversary Special Edition |
| 2025 | Mazda | MX-5 Miata | 35th Anniversary |
Specifications
| Detail | Value |
|---|---|
| Part Number | ZM14-HDSS |
| UPC | N/A |
| Pressure Plate | ACT Heavy Duty |
| Disc Type | Performance Street Organic, Sprung Hub |
| Hub Style | Sprung |
| Application | 2019-2025 Mazda MX-5 Miata ND2 |
| Street Use | Yes |
| Warranty | ACT Limited Warranty |
| Country of Origin | USA |
What's Included
- ACT Heavy Duty pressure plate assembly
- ACT Performance Street organic disc (sprung hub)
- Release bearing
- Clutch alignment tool
- Mounting hardware
About ACT (Advanced Clutch Technology)
Advanced Clutch Technology (ACT) is a California-based manufacturer of precision clutch systems serving street, track, and competition applications worldwide. ACT engineers every component in-house using proprietary materials and processes, including their signature multi-stage heat-treated diaphragm springs and high-copper organic disc compounds. The ZM14-HDSS reflects ACT's commitment to building platform-specific clutch solutions that deliver measurable performance gains while maintaining the engagement characteristics enthusiasts expect from street-driven sports cars like the Mazda MX-5 Miata.
Frequently Asked Questions
What years of Mazda MX-5 Miata does the ACT ZM14-HDSS fit?The ACT ZM14-HDSS fits the 2019-2025 Mazda MX-5 Miata including the Sport, Club, Grand Touring, RF Club, RF Grand Touring, 2020 100th Anniversary Special Edition, 2020 RF 100th Anniversary Special Edition, and 2025 35th Anniversary trims.
Does the ACT ZM14-HDSS fit the RF (retractable fastback) version of the MX-5 Miata?Yes. The ZM14-HDSS fits the MX-5 Miata RF in the RF Club and RF Grand Touring trims for the 2019-2025 model years, including the RF 100th Anniversary Special Edition in 2020.
Is the ACT ZM14-HDSS suitable for daily driving?Yes. The Performance Street organic disc with sprung hub maintains the smooth, light clutch feel that MX-5 Miata drivers value, even with the heavier-clamping Heavy Duty pressure plate. Pedal effort increases modestly over stock but remains manageable for daily commuting.
Does the ACT ZM14-HDSS kit include a flywheel?The ZM14-HDSS kit includes the pressure plate, disc, release bearing, alignment tool, and mounting hardware. Please verify with your parts supplier whether a flywheel is included in this specific configuration before ordering, as ACT offers both with-flywheel and clutch-only configurations.
Will the ACT ZM14-HDSS work with a modified or tuned 2019-2025 MX-5 Miata?Yes. The Heavy Duty pressure plate in the ZM14-HDSS is designed to handle power levels above the factory clutch threshold, making it well-suited for Miatas with intake, exhaust, tune, or other performance modifications that increase torque output.
How does the ACT ZM14-HDSS compare to a stock Miata clutch?The ZM14-HDSS delivers significantly higher clamp load than the factory clutch, improving torque handling and wear resistance for performance driving. The Performance Street disc retains organic friction material for smooth engagement similar to stock, while ACT's four-stage heat-treated diaphragm ensures greater longevity under spirited driving conditions.
Does the ACT ZM14-HDSS require professional installation?Professional installation is recommended. Clutch replacement on the MX-5 Miata requires transmission removal, and precise torque specifications and alignment are critical for correct operation and longevity of the new components.
Is the ACT ZM14-HDSS covered by a warranty?Yes. The ZM14-HDSS is backed by ACT's limited warranty against defects in materials and workmanship. Warranty terms and claim procedures are available directly through ACT or an authorized ACT dealer.
Does the ACT ZM14-HDSS fit the 2019-2025 MX-5 Miata with automatic transmission?No. The ZM14-HDSS is a manual transmission clutch kit and is only compatible with MX-5 Miata models equipped with the 6-speed manual gearbox.
Installation Instructions
- Safely support the vehicle and remove the transmission following the Mazda MX-5 Miata ND2 factory service manual procedure
- Remove the factory clutch assembly from the flywheel
- Inspect the flywheel surface for scoring, heat cracks, or warping and resurface or replace as needed
- Clean the flywheel mounting surface thoroughly before installing new components
- Insert the clutch alignment tool through the disc hub center into the pilot bearing to correctly center the disc
- Position the ACT Performance Street disc against the flywheel with the transmission side facing outward
- Install the ACT Heavy Duty pressure plate over the disc and torque the mounting bolts in a star pattern to factory-specified torque values
- Install the release bearing onto the transmission input shaft bearing retainer
- Reinstall the transmission and reconnect all drivetrain and suspension components per the factory service manual
- Perform a gradual clutch break-in with several moderate acceleration and deceleration cycles before applying full power
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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