Originally Posted by
noglider
@AtTyeKiller, all that is true, but why give a number to a tire that is large than another tire when it is smaller than that other tire? That's what annoys me, not the mere inaccuracy.
It's not. 622-32 and 630-28 tires are about 27" outer diameter, 584-55 tires are about 27.5". The same is true of 26" and 29er, and also of the French A-B-C system where originally all the various wheels with their matching tires were supposed to be 650mm or 700mm. Naming tire sizes by outer diameter is a perfectly valid approach when trying to explain how big something is, especially when marketing to a customer who doesn't care very hard.
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."