Fitment: (15-19) Polaris RZR 900, (15-19) RZR S 900, (17-19) ACE. Replaces OEM Belts: 3211172. NOTE: Picture may not reflect actual product. Why G-Force RedLine CVT Belts? Greater heat resistance and recovery, even under severe duty cycles. Optimized, patented EE compound maximizes axial stiffness enabling belts to run at higher continuous torques or loads. Innovative design results in better acceleration, higher top speeds, less speed ratio and energy loss in extreme off-road environments.