The inspiration for this bike stand came from something I saw somewhere on the Internet, but that was a fixed design and suitable for only one tire size. I wanted something adjustable so it could be used for all of our bikes (road, gravel, and mountain). The slotted holes allow one side of the stand to be moved to accomodate tire widths from 3/4 inch up to 2-1/4 inch. It's just made from construction grade 2 x 4 (nominal) SPF. So far I've made six of them. They're handy for storing the bikes upright and for doing simple maintenance when a bike repair stand isn't available.