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Did you mean to say that the stems end up longer than expected?
Yes, thanks. That is a useful catalogue you linked to, which also covers their measurement systems for other items such as handlebars. I have edited the message of mine above yours to correct the direction of the difference in stem lengths reported in earlier threads, e.g.,
by @StandardPractice in
https://www.lfgss.com/comments/8046256and
Nick_S
Did you mean to say that the stems end up longer than expected? That would certainly be the case with the Pearl (NP) quill stems. For example they are advertised as, let's say, Pearl 10 (100mm), and they end up as ~105 - 110 mm, measured along the stem extension itself, like most stems are measured. Following the diagram that you provided, and the diagrams from their catalog http://nitto-tokyo.sakura.ne.jp/Catalog.pdf it shouldn't be too hard to figure out, since there is a diagram explaining the measurement method for almost every model.
But I wonder what would the measurement method be for the NJ-89 stem. There is no measurement diagram for that model. If we assume that they use the same method as for other threadless stems, it would be ok, but it is possible that they are measuring them as the Pearl models, perhaps because they are both NJS approved models, used for keirin racing, so it might be the case. Some NJ-89 stems looked a bit longish for the given length, on photos, although I haven't measured any or seen it in person.
Does anyone have any experience with the measurement of the NJ-89 model?