Wheel is scaled to 18' and includes tire and brake system. Scene units are set to decimal inches. Also includes V-Ray materials and textures as well as alternate V-Ray materials for different wheel colors. Entities requiring smoothing use a TurboSmooth modifier with 2 iterations. All renders done with V-Ray materials and V-Ray renderer. The scene is set up with V-Ray as the renderer. The OBJ file contains no smoothing or materials.