forte gotham tire is a good city tire semislick. I have been using mine on my mtb for over a year and the tread still looks new and I havent had a single flat on em. They are priced pretty good too, I think nashbar offers the same tire but under a different name so you may be able to get it cheaper. I believe the tire size I have are 26x1.75 and my original knobbies were 26x2.25 I think.