ArkyKenny on 5/23/2013 12:35:51 PM:
What you have should work fine. Thorns are more of a problem in the fall. Right now you'll be dealing with loose top surface, ruts, transition areas where the trail crosses roads and driveways etc. That, plus the little limestone "Arrowheads" that are always on the Katy.
I'm a fan of big/wide tires with about 65 psi of air. I ride 700c x 40 semi-slicks. Before I got them, I used mountain bike I put drop bars on with 26 x 1.75 semi-slicks. I don't like vibration, ruts, or being careful when I cross a road. But those are my preference, not what you need.
Others swear by 28's or 32's. There has been thread after thread of discussion on the subject on this page. You can no doubt read for yourself those threads, but IMO, what you have will probably work fine (unless you are looking for a reason to get something else--Then you need to go get what you want!!!).
However you go, bring tubes, a patch kit, and a pump: Then have fun.