All modeling and rendering was done in Blender 2.73. Purely quads and triangles. No evil ngons!
In essence this is a heavy duty offroad truck tire or a tractor tire. It is quite massive in size, having a 1,24 meter diameter and being 0,7 meters wide.
This model doesn't necessarily need subsurface modifiers, or at the very least I would advise against it especially on the treads as they are not designed for such. However the treads hold up very well, in my opinion, for close-up renders.
Every format includes .blend render scene that allows you to just open it in blender and start rendering.
Please note that the HDR used to partially light the render scene is NOT included with your purchase, so your results may differ from above images!