3 Wheel Calculator Imperial Metric Converter and Date Finder. Digitally printed in high resolution full colour & UV Varnish directly on to the .020 White Vinyl Plastic material. This makes for a top quality, long lasting wheel. Use our standard template or supply your own customized one. Custom imprint and bleed edge allowed. Outside wheels 3.625" dia. and 3.19", Middle wheel - 4.13" dia.