STM Primary Clutches

If you’re looking to boost the performance of your ATV, UTV, or Side by Side, upgrading your clutch system is one of the most effective ways to enhance acceleration, power transfer, and overall ride quality. Whether you’re outfitting a Polaris RZR Pro XP, Can-Am Maverick X3, or another powerful machine, choosing the right clutch kit can make all the difference. In this guide, we’ll dive deep into the best clutch options for CVT-equipped vehicles, including STM Primary Clutches, STM Secondary Clutches, and Aftermarket Assassins clutch kits.

What is the Role of Clutch Kits in ATVs, UTVs, and Side by Sides?

The clutch system in your ATV, UTV, or Side by Side is responsible for transferring power from the engine to the wheels, ensuring smooth acceleration and consistent power delivery. In a CVT (Continuously Variable Transmission) system, the primary and secondary clutches work together to control the gear ratios, maintaining optimal engine RPM and adjusting to driving conditions. Proper clutch tuning ensures improved performance, increased durability, and better fuel efficiency—whether you're cruising on dirt trails or navigating tough off-road environments.

Why Clutch Kits Matter for Off-Road Vehicles

Upgrading your clutch system offers multiple benefits:

• Improved Acceleration