ACT 600255 XACT Prolite Flywheel for 1990-2005 Mazda Miata MX-5

Vehicle Fitment

• 1990-2005 Mazda Miata / MX-5 (Various trims, 1.6L-1.8L I4 GAS FI)

Features

• Lightweight Prolite flywheel for dramatic throttle response and acceleration
• Forged chromoly steel construction for high strength and rigidity
• Induction-hardened ring gear for extended service life
• One-piece design prevents separation and warping under high rpm
• Dynamically computer balanced for smooth high-rpm operation
• Serviceable and can be resurfaced without purchasing new parts
• Recommended for road racing, rally, and performance driving
• Significantly reduced inertia compared to stock flywheel

Specifications

• Flywheel Type: XACT Prolite lightweight performance
• Material: Forged chromoly steel
• Friction Surface Diameter: 8.8 in / 225 mm
• Tooth Count: 112
• Product Weight: ~9.4 lbs (significantly lighter than OEM)
• SFI Rating: 1.1 certified
• Recommended Use: Road race & rally (reduced street drivability)
• Balance: Dynamically computer balanced

Included Components

• 1x XACT Prolite flywheel (ACT 600255)

Product Description

The ACT 600255 XACT Prolite Flywheel is a precision-engineered lightweight performance flywheel designed for Mazda Miata / MX-5 vehicles from 1990 through 2005. Its forged chromoly steel one-piece construction and induction-hardened ring gear provide exceptional strength and durability, while the dramatic reduction in inertia delivers quicker throttle response and more aggressive acceleration compared to a stock flywheel. The Prolite design is ideal for road racing and rally applications where performance and throttle feel are prioritized over everyday street smoothness.

Dynamically computer-balanced for smooth operation at high RPM and serviceable without needing additional parts, this lightweight flywheel fits manual transmission Miata models across multiple years and engine sizes (1.6L and 1.8L). Enthusiasts appreciate the improved rev-up feel and racing-oriented performance characteristics, but due to its reduced drivability relative to heavier flywheels, the ACT 600255 is best suited for track-focused builds and performance upgrades.