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Interesting.
SJS claim 25.8mm and the ability to use 25.4 or 26 clamp.
My stem is 26, so not an issue...https://www.sjscycles.co.uk/handlebars/360-nitto-b125-steel-drop-handlebars-258mm-clamp-silver/
t4ny4
B125 are 26 and b123 are 25.4
I wouldn't squeeze b125 into a 25.4 stem as you'd ruin the splines and it could easily slip.