ACT ZM1-HDSS Heavy Duty Street Sprung Clutch Kit for 1990-1993 Mazda Miata

Vehicle Fitment

• 1990-1993 Mazda Miata (Base/SE/LE, 1.6L I4 GAS FI, Manual Transmission)

Features

• Heavy Duty diaphragm pressure plate increases clamp load and durability
• Performance street sprung clutch disc with premium organic friction material
• Reduced marcel design for quicker shift action and improved engagement
• Light to moderate pedal effort with smooth positive engagement
• Quiet operation with OEM-to-mild gear rattle typical of street setups
• Longer friction life through ACT's exclusive diaphragm design
• Precisely assembled and dynamically balanced for high-RPM reliability
• Recommended for spirited street driving and occasional race use

Specifications

• Clutch Disc Diameter: 7.9 in / 200 mm
• Disc Material: Organic friction with steel backing
• Disc Type: Sprung street performance
• Pressure Plate Type: Heavy Duty diaphragm
• Input Shaft Diameter: 0.9375 in (15/16 in)
• Spline Count: 22
• Approx. Torque Capacity: ~195 ft-lbs (~45 % over OEM)
• Product Weight: ~10.8 lbs
• Flywheel Included: No - must be used with factory flywheel

Included Components

• 1x Heavy Duty diaphragm pressure plate
• 1x Performance street sprung clutch disc
• 1x Clutch release bearing
• 1x Pilot bearing
• 1x Clutch alignment tool

Product Description

The ACT ZM1-HDSS Heavy Duty Street Sprung Clutch Kit is a direct-fit performance clutch upgrade crafted for **1990-1993 Mazda Miata** models equipped with the 1.6 L I4 engine and manual transmission. This kit pairs ACT's robust Heavy Duty diaphragm pressure plate with a premium organic sprung clutch disc, delivering increased clamp load, smooth engagement, and improved durability compared to many OEM clutch assemblies. The reduced marcel design helps promote quicker shift action, while light to moderate pedal effort and quiet engagement make it well-suited for spirited street driving and occasional track use.

Carefully assembled and dynamically balanced, the ZM1-HDSS offers reliable high-RPM performance and extended friction life thanks to ACT's exclusive diaphragm design and high-copper organic friction materials. The kit includes the release bearing, pilot bearing, and alignment tool to support installation, but it requires use of the factory flywheel, as no flywheel is included. This clutch is ideal for enthusiasts seeking an upgrade that improves performance and longevity while maintaining everyday drivability.