Hey MB, i run the Shinko 705's front and rear. I run the t=standard size front and a 140/80-17" in the rear. I run each of them 36F/42R respectively. Once off road i usually keep them the same unless i'm getting into lots of loose rocks/gravel then i run them down to about 26f/30R depending on my load of course. YMMV.What tires are you using for that. I live here in Washington and want to explore some logging roads Ect.