andi
from oz's which were fitted with radial brakes, the offset of wheel is different because of brakes
people have fitted them to conventional calipers
not a 100% sure but from what i remember reading a while back i think you need to mill 2.5mm of each face where the disc bolts to
if you fit non radial oz's to a radial bike you have to fit spacers which you can buy from rsvr.net