Originally Posted by
MONGO!
Sizing is the same as you would be on a road bike, you can use a MTB front hub and rear derailleur, you'll need road brifters and compact crank (46/36T double is common).
For rims Mavic Open Pro are a good choice.
although a lot of geometry is a little different, in the frame im looking at (soma double cross) a 54 matches the geometry of my 56cm cannondale roadie.
go to a shop that knows cyclocross and chat at them