What's Cavitaion you ask? For us at Pro Rider it means something different than the real definition.Wikipedia: It's when an impeller's blades move through the water, low-pressure areas are formed as the fluid accelerates around and moves past the blades. The faster the blades move, the lower the pressure around it can become. As it reaches vapor pressure, the fluid vaporizes and forms small bubbles of gas. This is cavitation.At pro Rider cavitaion is a 2 page spread in every issue filled with random fun photos with captions. Here is a video of Cavitaion photos from 2013 Pro Rider issues.