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MTB I've read about a lot, though I think someone, somwhere, in the dark hinterlands of the net might have mentioned CX...
There are also other methods that don't use tubulars, but still for MTB:
http://www.bikeradar.com/forums/viewtopic.php?f=10004&t=12981525
http://www.pinkbike.com/u/sinki/blog/diy-ghetto-procore.html
Plus someone using a tubular tyre for a MTB set up:
http://instaliga.com/tarhof/987548975753989791_14286922/all-comments
Wait. What?! CX or MTB?