Clutch Masters 850 PRO Series Clutch Kit - Mazda MazdaSPEED3 (2007-13) / Mazda MazdaSPEED6 (2005-07)

Available Stages:

• "Sprung Race" (PTD80) - 1 sprung ceramic disc, directly connected to a second ceramic disc
• “Rigid Race” (PTD8R) – 2 ceramic disc with driven rigid hub

The FX 850 PRO Series is a 8.5" (216mm) unit that is the next evolution of multi-disc clutch performance from Clutch Masters—engineered for 2026 and built to dominate. After more than 15 years of proven success with the original FX 850, this all-new PRO Series has been completely redesigned to push the limits of strength, durability, and performance. The result? The most advanced and capable 8.50” clutch system we’ve ever produced—period..

What Sets It Apart? 12 heat-treated 4140 steel stands 12-point nut and stud mounting system Next-generation driven hub design

The FX 850 PRO replaces the traditional 6-post aluminum setup with a 12-post, heat-treated steel foundation. Why? Because high horsepower and aggressive driving expose weaknesses—and we eliminated them. The new design delivers unmatched structural integrity, resisting flex, wear, and failure under extreme torque and heat. The re-engineered driven hub takes performance even further. By utilizing a single, precision-driven hub instead of multiple contact points, installation is faster and alignment is cleaner. More importantly, it maintains constant, even engagement with the transmission input shaft—reducing spline wear and increasing reliability when it matters most. Available in twin or triple disc rigid configurations, the FX 850 PRO Series is equipped with ceramic friction materials designed to handle serious abuse on the street or track. Flywheel options include 6061-T6 billet aluminum for reduced weight or 4140 billet steel for maximum strength—giving you the flexibility to match your build

Built to Perform. Built to Last. Every FX 850 PRO unit is fully serviceable, with rebuild kits and replacement components readily available—because real performance parts should be made to go the distance. Proudly manufactured in the USA, Clutch Masters controls every step of the process—from design to final assembly. This hands-on approach allowed rapid development, real-time improvements, and direct input from competitive race teams to shape a clutch that performs under the harshest conditions.

Flywheels are made for each specific application in either aluminum or steel. Our aluminum flywheels are machined from billet 6061-T6 aluminum to meet SFI spec 1.2 for competition in NHRA, NDRA, IDRC, IHRA, SCCA and NASA. Aluminum flywheels are Type 3 hard coat anodized to ensure their durability and performance lasts. Each aluminum flywheel includes a replaceable insert. Steel flywheels are machined from 1045 billet cores and are then black oxide treated for rust prevention.