Mine's at 570mm, and that's slightly higher than stock would be by about 5mm.
To set yourself a baseline to work from the ride height adjuster should be 261mm between eye centres (pain to measure on the bike)
This should give you a reference to start from. But take a look at this thread and get your name down for a ride height tool to do it properly
http://217.199.188.40/xmb/viewthread.php?tid=16584 [Edited on 7-4-2005 by Mr_S]