ACT Clutch Flywheel

ACT XACT Flywheels: Engineered for Every Level of Performance

When it comes to clutch flywheels, Advanced Clutch Technology (ACT) stands in a class of its own. As clutch flywheel specialists, ACT approaches every flywheel design from an engineering-first perspective — using rigorous laboratory testing, CAD modeling, and Finite Element Analysis (FEA) to develop flywheels that outperform and outlast the competition. The result is the XACT Flywheel line, a comprehensive family of performance flywheel upgrades built to serve everyone from the daily street driver to the dedicated track racer.

The XACT Flywheel Lineup: Streetlite, Prolite, and Pro-Mass

All applications in the XACT Flywheel line are lighter, stronger, and safer than OE cast flywheels, meeting the needs of both the enthusiast and hardcore racer. Within that lineup, ACT offers distinct variants tuned for different driving goals:

• Streetlite: The Streetlite option is a lightweight upgrade designed for performance and affordability, without compromising a smooth idle. It's the go-to choice for street-driven vehicles that see occasional track days.
• Prolite: Prolite flywheels are made for the racer. This version takes the weight reduction concept to a further extreme, offering the best possible acceleration with some minor compromises in idle quality and, in some vehicles, occasional, non-damaging transmission gear rattle.
• Pro-Mass: The Pro-Mass flywheel was developed with more inertia for improved climbing and pulling capabilities. Mass distribution techniques give an optimized inertia increase with a minimized weight penalty. This variant suits off-road builds and torque-heavy tow applications.

Chromoly Forged Construction and SFI Certification

Flywheels for both performance and racing are weight optimized for an ideal balance of Moment of Inertia and strength. ACT uses one-piece Chromoly steel forgings, the strongest manufacturing method available, to best align the internal grain structure. This forged construction is then CNC-machined to tight tolerances, and features an induction-hardened, integral ring gear for increased durability. The integral ring gear design also permits more weight reduction where it matters most and eliminates the chance of gear breakage or separation.

Safety credentials matter on the track, and ACT delivers. Each ACT flywheel is certified to meet SFI Specification 1.1 standards, making them legal for competition where SFI 1.1 certification is required or recommended. XACT flywheels come complete with an official SFI sticker and serial number, as required for certification.

Resurfaceable, Serviceable, and Built to Last

Unlike many competitors' flywheels, ACT flywheels are serviceable and can be resurfaced with no need to purchase additional parts. This makes them a smart long-term investment — when it's time for a fresh clutch install, you simply resurface the existing flywheel rather than replace it entirely. Prolite flywheels are aggressively tuned for competition use, and rival the MOI of the lightest aluminum flywheels without any of the potential reliability or maintenance concerns.

Broad Application Coverage

As an industry leader in performance clutch and flywheels, Advanced Clutch Technology uses state-of-the-art material element analysis and laboratory testing to make various clutches, kits, and flywheels used by motorsports enthusiasts at many levels. ACT's XACT flywheel catalog spans a wide range of popular platforms — from Honda and Subaru to BMW, Mazda, and Volkswagen — ensuring that enthusiasts can find a flywheel precisely matched to their vehicle and build goals. Whether you're building a street-tuned daily driver or a full competition machine, ACT's clutch flywheel engineering leaves nothing to chance.