Originally Posted by
531phile
Get one with an inverted pattern. There will still have some knobbies on the side of the tire, but flatish in the middle for the road.
I think some people call this semi-slick. Maybe inverted is the wrong term, but anyhoo:
http://bicyclewarehouse.com/itemdetails.cfm?id=8598
This is what you should get. Well, not exactly this tire, but this style. I never tried this tire myself. Looks like a good tire so try it and see for yourself. I'm sure someone else will chime in with a recommendation.
One more thing to consider with this style of tire is that the shoulder knobs could possibly hook a fender strut, causing the fender to fold up and lock up the wheel. I've run fenders with mine, after convincing myself the fender was centered well enough and was sturdy enough to not get into the knobs, but it always made me nervous on rough terrain.