4200105 is an ACT 4-Pad Sprung Race disc built with premium ceramic friction material for aggressive engagement and quick shifts, with OE to mild gear rattle. Wraparound spring windows, thicker retainer stampings, and a heat-treated spring-steel drive plate add support, reduce stress concentrations, and increase strength and reliability. It carries a high burst strength and holds roughly 28% more torque than a typical organic disc, and is recommended for race use only.
Installation InstructionsWarranty
Specifications:
- Disc Type: 4-pad sprung-hub race disc (ceramic friction material)
- Wraparound spring windows and heat-treated, spring-steel drive plate for added strength
- Holds approximately 28% more torque than a typical organic disc
- Recommended for race use only
- Backed by ACT's one-year limited warranty
- Part Number: 4200105
Vehicle Applications:
- 1990 Mazda Miata
- 1991 Mazda Miata
- 1992 Mazda Miata
- 1993 Mazda Miata
- 1993 Mazda Miata LE
- 1991 Mazda Miata SE
FAQ
What is a 4-Pad Sprung Race disc used for?
It is a ceramic-lined race disc built for aggressive engagement and quick shifts, and ACT recommends it for race use only rather than daily street driving.
How does this differ from the Perf Street Sprung organic disc?
It uses ceramic friction pads instead of an organic lining, which raises torque capacity by about 28% but produces harsher engagement and more gear rattle than the organic street disc.
Does the sprung hub reduce driveline shock?
Yes, the disc keeps a sprung hub with wraparound spring windows and a heat-treated spring-steel drive plate, which cushions driveline shock even with the more aggressive ceramic lining.
Is professional installation recommended?
ACT provides installation instructions and a one-year limited warranty with the disc, and because it is a race-oriented clutch component, professional installation is recommended.
