I'd bought some used rims for my odyssey, the bolt pattern fits perfect but the center bore on the rims is smaller so what could happen/
I'd say Japan, since her budget, in a sinecure under US nuclear blanket and not as addicted to welfare (yet) as we are, can devote much more funds to civilian technology than US can.
30 inchesthis depends on the area you live of course. Construction in Central Texas and Northern California require 30 inches.