I still think the 559 is NOT and never was the world standard. Only popular in the knobby MTB areas, mostly America, WalMart World and Latin America?? No clue about Russia or east Europe.
28"/ 622 was/ is the vast preponderance with one speed bikes in China, India, Europe. Africa and lots of other countries. Easily a BILLION of these. The low countries around Holland have 2% defaileur bikes still. If not 28"/ 700c, then 590 I would think. I'm not sure which is the SS standard in Vietnam, they certainly are 32/ 35 mm generally in any country.
584 is the new standard for MTBs in Asia, thankfully IMO.