AMuzi wrote:

OK, list a few current bikes with 35mm threaded
BB, 22.0mm stem or 25x1 headsets please.
Then root around your bike shop for 5mm bolts
threaded 0.9 SI rather than the dominant DIN
0.8.
While you're there, look for current
production 14mm pedals.

This must be some other SI than the
unit system.

The French industrial standard is called AFNOR
(Association Française de Normalisation) and
there is no mention of "SI" on the Wikipedia
page. [1] But maybe it was once called SI?

I suppose any country, or even any
manufacturer, can come up with its own
incompatible gear and then call it a standard.

[1] https://en.wikipedia.org/wiki/AFNOR

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