You can get most 700 tires in Thailand especially in the north because cycling is getting very popular here. in my local shop you can get 23mm up to 40mm and order other stuff too. when touring in Laos i found zero 700 or 26" its all 24" so the 26" is everywhere is a myth. Oh and 650B is everywhere here to and I'm a strong believer this is the goldilocks zone for touring too :-)