Dave Plowman wrote:
in ,

: In article ,
: Ross Matheson wrote:
: "Not all 19" racks are the same width:
: The British Post Office spec 19" = 484mm between rails
: typical modern American racks 19" = 487mm"
:
: Strange given the correct figure is 482.6. ;-)

I was only quoting another post - presuming he knew or had measured.
What's your source for that? Did you follow the link to the other thread?