This ultrex 3 piece wheel is the first of it39s kind in scootering to give riders the option to interchange their urethane when the wheel gets chunked de hubbed or too worn to ride the symmetrical hub design makes for simple installation replacement with out patent pending 5 bolt design3p technology makes this wheel an easier more efficient way for you to enjoy any style of riding or terrain you ride on this invention fills a current need in scootering and it can be desirable to sell