It's just a plain ol' disk cover from wheelbuilder: http://www.wheelbuilder.com/aerodisc.html

I drew up the graphics on photoshop and printed it out on big sheets of adhesive vinyl. The only tricky part is applying the graphics on a slightly conical shape without getting any air bubbles.



I also did the "Vitruvian Man" graphic a couple years back and it turned out well.

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