Riding outside in strong wind may not be your cup of tea, but creating your own wind is a whole different story. The CycleOps Wind trainer has a vortex blade design that generates progressive resistance for an effective workout, whether your focus is steady spinning, intervals or climbing. You control your effort. Increase your effort by shifting up or increasing cadence. Decrease your effort by shifting down or decreasing cadence--just like you would on the road.Die-cast zinc blades double as a heavy flywheel for smooth, realistic pedaling. Trainer folds for storage when your bike is not attached.