Tires on the Brompton are expensive, you surely want to use them to the max. Experience told me the rear tire last around half as long as the front tire. By swapping the tire between the front and the rear during their life spam, you can really max out the usage on them.
Better known as the titanium guy at Bike48/Brompton slimming center. Always trying to tell people titanium is 41% lighter than steel. Proactively modding up his Brompton with the leftover parts!