I've been riding on the road lately more than I care to admit. Even though it would be nice to run some sort of hybrid tire i still run a full on MTB tire ( Big Betty, and Da Minions) cause as soon as get on a trail those wimpy tires really show their face. So yes, I'm slow as hell with my MTB on the road but I guess I don't care. It makes me stronger due to the added resistance and if I need the speed I take out the road bike and really have a crap ride. Moral of the story: stay on the trails as much as possible.