Elite Power Fluid Trainer Powerfluid resistance technology provides exceptionally smooth resistance and tops out at over 900 watts-perfect for everything from a quick cool-down spin to the most challenging intervals Spring-loading mechanism to assure proper resistance against the tire Elastogel roller reduces noise by 50-Percent and tire wear by 20-Percent Quick thread hub clamp and spring-loaded resistance mechanism ensure quick, proper setup Extra wide, stable steel frame folds flat for storage or transport and fits wheels from 24-Inch to 28-Inch (700c road)