This is off road thread patterned tyre for trucks, tractor trailers, buses for wheel size 900x20. Originally designed in Autodesk Inventor 2012, since that file size is so large, i am uploading IGES version. If anybody likes, let me know, i will send the original Inventor file link to download. You surf the www, but its very hard to find a off road tyre 3D models. All tyre models are just fancy easy radial cut thread pattern. I spent lots of time for this. Finally it came out well. Thankx GrabCAD...!!!