IM currently on the 17inch dirt tire tip to! your gonna have to run a narrow rear on your front rim might even have to trim the knobs, but it wouldn't hurt the run them, the adventure guys run them on their street trips so im assuming that they wont seperate or blow up on you, but the key word here is ASSume..
just thought I would chime in and let you know your not the only one thinking of this.
I tried the IRC vulcanduro's on my husky 510. Worked ok in wet or rocky but the square profile on the rear is real sketchy in dry/slick. No matter what, a 4 inch wide front tire will never make a woods weapon.