When I converted my mtb to a commuter, I started with michelin wildgripper city. Heavy and flatted a lot. I then tried specialized fatboys but they were a still a little slow for me and I wiped out in the rain once (ah. anecdotal evidence). Now I run specialized all condition 26x1.0 tires. flatted only once in about 2000 miles when a shard of glass worked its way through the tire. They have the "flak jacket" technology meaning they have a kevlar belt but it doesn't go up the sidewalls. kevlar bead. can pump up to 120psi. my commute is all paved pretty well so I love them.