actually it's the rim. The tire is measured at the bead as 20" and then other measurements involve width.
could be, i was assuming it was the same as a MTB rim... cause mtb wheels aren't 26" across... even still i'm not entirely convinced... cause if you factor in a tire, it's gonna stick out about 1.5 inches on either side of the rim at least, giving you a 23 inch tire??? almost 2 feet... i dunno....