Originally Posted by
nfmisso
More to the point; why isn't everyone using ETRTO designations? In automobiles, trucks, motor vehicles - just about everywhere else, tires are designated by the bead seat diameter (BSD). It would a great deal less confusing for everyone if bicycling followed the same standard.
Actually, motor vehicles have their own version of stupid mixing of measures....why is the wheel size in inches, and the rest of the tire dimensions in millimeters? I recall Michelin tried to introduce the metric radial over 30 years ago, and it wasn't accepted.