My LBS checked the rear wheel and says it's true. I believe him. But at low speed I can feel and hear a thump or bump. It is very noticable when I spin it up in the bike stand.
Since I primarily a commuter I have slime tubes and gator skins. I realize it takes a few minutes for the slime to disperse but I noticed it yesterday 40 miles into a long ride.
While replacing tire and tube is a obvious first step I was hoping to hear if others my have had a similar issue.