I used to ride to the off road areas. The problem I encountered was tire wear. If I mount the tires (tyres, Yes?) I needed for off road they wear out real fast. If I run a 50/50 street/trail they fail miserably once I get off road. If I want to ride off road I transport. I have 2 sets of wheels for the KLR650 and the KX500 I have street tagged. There is no way around it, a good street tire is just that a good street tire. The same goes for dirt tires. Good on dirt bad on the street. The best dual purpose I have used is the Continental TKC-80.
They come stock on some of the BMW dual sport bikes.
http://www.tiresunlimited.com/ALL%20TIRES/Continental/continental_tkc80.htmThey wear ok on the street but they fail BIG time if you get in the mud. They "chunk out" real bad it you get into rocky mountainous terrain. If you like a tire off road you won't like it on the street and vice versa.
I left out that when I transport I still ride a bike to the off road area......................