This is a parametric model of a wheel for a radio controlled touring car. Nearly every dimension can be changed in OpenSCAD. The .stl file should work with standard 1/10th scale touring car tires. Here are the relevant dimensions. OD: 48 mm (1.9") Width: 26 mm Offset: 0 mmI used shapeways to print this in strong white and flexible. It was very strong. I had to stomp on it with my steel-toe boots to break it!