Abstract: A truck assembly for a skateboard includes a single rotating sphere for allowing free movement of the skateboard in a 360° direction. A hanger having a pair of side flat circular bases are provided to receive a wheel assembly having the single rotating sphere facing the ground. The wheel assembly includes a screw element to removable engage a hole provided on the side flat circular base and a fixing element is also provided to prevent the wheel assembly to move around the screw element. The wheel arrangement and the truck assembly of the invention allow a skater to easily interchange the truck assembly without modifying or altering the existing skateboard.