Does your RZR grind when you shift from park or neutral into gear while at an idle? One of the most common problems that can cause this is not enough belt-to-sheave clearance in the drive clutch. These shims allow you to adjust your belt-to-sheave clearance for proper operation. They are cut to precise I.D. and O.D. dimensions to ensure proper fit in stock Polaris UTV drive clutches. Note: Specialized tools are required to install spider shims. Please inquire or refer to “Related Items” tab above. Spider shimming services are also available through SLP (Starting Line Products), please inquire.