A big steel wheel for tanks and tractors with tracks. The model was created in Blender. In the Blender version most of the modifiers are in place, so you have quite some freedom to make changes. The screws dont need to be subdivided. Objects that can be subdivided are in their separate layer. The important objects are UV unwrapped and the faces are non-overlapping in the UV space. I also made sure that objects have reasonable names (not like cylinder.001) Wheel diameter is 80cm and the width is about 41.5cm.