Fusion Pro R Primary

The Fusion Pro R by KWI is the direct evolution of the proven UltraShift Pro R — built on the same aerospace-grade pedigree, refined by the riders who pushed it hardest. More aggressive power delivery, different weight profiles, a quieter clutch, longer belt life. We listened, then we engineered it.

The redesigned moveable sheave features wider weight pockets with increased weight support, giving you a broader tuning range right out of the box. Sidewinder weights and Sidewinder rollers deliver smoother, more consistent engagement under hard throttle — whether you're running stock power or chasing boost with a turbo or supercharger.

RPM adjustability is easier than ever — set screw adjustment no longer requires weight removal, so dialing in your shift curve is faster and less of a hassle at the trail or in the pits. Reinforced slider shoes hold up under sustained hard use, and lighter base spring loads reduce drivetrain stress to keep your belt running longer between replacements.

Wrapped in KWI's Groovix cooling technology, the Fusion Pro R manages heat where belts fail most — keeping temps down, grip up, and your build moving forward. Engineered for the 2022+ Polaris RZR Pro R and RZR Pro R 4, this is the clutch for riders who want more out of every run.

Learn about the 2027 Polaris RZR Pro R Boost.