Dr. Pulley products are some of the best on the market today! This racing variator from Dr. Pulley is precision-engineered to increase performance over stock Polaris RZR 170 Primary Drive. The steep angle ramp plates in the Dr. Pulley variators allow for a faster and smoother engagement at all speeds, allowing lighter weighted sliders to fully extend to make the most of your CVT system. Rollers or sliders weights not included.