Ranger 1000 Inner Clutch Sheave P90XOEM Inner Clutch Sheave for P90X Primary Clutch (2018+) This is a genuine OEM Inner Clutch Sheave designed specifically for the Polaris P90X primary clutch. As the stationary half of the primary clutch, the inner sheave is a critical component for maintaining a true belt path and ensuring smooth shift transitions. If your original sheave is grooved, pitted, or has suffered from heat damage, replacing it is essential to prevent premature belt failure