This file will print a set of tires that includes two front and four rear, with planetary type hubs. The tires are 18" across the tread, and just slightly over 52", designed to fit with the other heavy oilfield frame and bed I offer. However, the set can be used with any similar application of course. I also offer a set that has rims that allow for a tandem rear wheel set up. The tread and bolt head detail is set so the Frosted Detail materials are the best choice. Should you have any issues, contact me via the shapeways designer link or via email to modelmechanic@gmail.com