This is a new design tire for mini servo motor support that I designed, for one of my projects, in the third picture is shown the almost complete project. the .zip file just include the 3.5inch tire, people who wants the chasis and other parts of the project can ask for the parts that I still don't upload because the project is not finished at the moment. There is too a 2.5inch tire in my accountIt was developed in SolidWorks software.