Dunno how big of tires you can fit under one, but I regularly ride 32mm tires on gravel roads. I have ridden them on forest/two track road, although probably not to the level of logging road (depending on the exact conditions, I imagine deeply rutted, muddy, etc). Wouldn't be my first choice, but if it was simply I was going to encounter them every once in a while in no great number, with the majority of riding on bike trails and road, I wouldn't hesitate to use one.