Had to change the wheel on my XT 600 E from 17" to 18" to get a descent mud tyre. easy enough, got another rear wheel and had it relaced with the rear rim off an old tenere I happened to have around.
cool! now I can run my fav tyre of all time - michelin Baja's! yeah!
Great tyre, pity they only come in the 140/18...soon as I hit the mud had issues with crud between tyre / swingarm / frame, not to mention this tyre was virtually feeding my chain / front sprocket more crap than it was roosting out the back...
changed down to a 130/18, prolly a bridgstone of some sort I think and the problem of the hungry chain ceases...
Saying that I rode the baja's on gravel / tarmac for the life of the tyre's (3 rears to 1 front

) with no prob's so prolly depends where your going i spose.