6/13 155mm 75 Hub Impeller – Optimized for 701–800cc Engine Packages Engineered specifically for 701–800cc engine packages, our 6/13 155mm 75 Hub Impeller delivers the ideal balance of acceleration, hook-up, and overall performance. This is the standard impeller fitted to every Revolver S1 ski. Whether you’re upgrading your current setup or fine-tuning a lower-displacement freestyle or recreational build, this impeller is designed to maximize efficiency and ensure your engine package performs at its full potential. Key Features: 6/13 pitch design 155mm diameter with 75mm Hub Optimized for 701–800cc engine packages Standard equipment on all Revolver S1 skis Excellent balance of low-end thrust and overall performance Ideal upgrade for lower cc engine builds