While perhaps not as visually impressive as some of my other work these simple wheels actually have an in-depth rig to allow for deformation of the tire, rotation of the wheels both to roll and to adjust direction so that they can be posed for different renders.

The front and back wheels can be detached from each other to add or subtract wheels, and more controls. This wheel rig was built with constraints as opposed to the former wheel rig I created that was made with bones.