i have my old cyclocross tires that came on my bike I put them on when I rode the Great Allegheny Passage this year. they were a little wider 28 vs 30 and had tread. People I was supposed to ride with said that I would want something with tread if it rained. It did not rain at all in 4 days of riding. Poured for 8+ hours on the drive home but not while I was riding. I commuted a lot on those before I put the michelin citys i have on it now. I have ridden a gravel trail with the city tires and they do okay. Just have to remember to not push it as hard.

so all that to say try it you might like them. It really is up to you and there is no wrong answer unless you put no tires on the wheel