Originally Posted by
rpenmanparker
Maybe that falls under what I mentioned as standards. Perhaps 10 mm of spacers would be the standard. Then there are internet sites where the conversions for fewer and more spacers can be done like that one that is used to compare stem lengths.
You'd also have to standardize which orientation the stem is installed. Aside from uncommon 0 degree stems it matters, too. Regardless, it would still likely be fine for manufacturers because by using 'standardized' measurements they could still conceal the fact that most frames of the same general size can be made to fit similarly regardless of the marketing label slapped on them.