In the model, dimensions are milimetres. Wheel diameter is 131 mm like as technical drawing. You can scale up with no defect. In the model there is no marking at the center.
Native Formats: SLDPRT (SolidWorks, filesize: 3.3 MB)
Exchange Formats: OBJ (OBJ, filesize: 268 MB), STL (Stereolithography, filesize: 84.9 MB)