Originally Posted by jtwind
Slow, cautious riding on gravel roads and relatively smooth dirt is fine and fun. As mentioned, anything else and you are limited by tires, ground clearance, weight and suspension. Even dual purpose airheads like the g/s aren't great in these situations unless much modified and prepped. But you should give it a try. Heck somewhere I saw a suzuki gsxr with knobbies that some character rode around the world.
I actually find my /6 and /5 easier to ride on gravel than my R100GS was. The CofG is low, they handle just fine on smooth gravel, and they were more predictable. I never knew what was happening beneath me on the GS.
I wouldn't try anything rough or loose, but I'd explore secondary unpaved roads to my hearts content on an old road-going airhead.