The ultimate 12 spoke ultra lightweight Spinergy wheel. Narrow custom made CNC machined alloy hubs, designed to decrease the overall width of the chair. PBO fiber spokes add superior strength, performance, and shock absorbency for a more comfortable ride. These state of the art designs and materials produce the lowest rotational weight of any wheel, allowing the user to go further and faster with less effort. Spoke colors available: Black, Yellow, Blue, and Red.