I have a '11 Ultra Limited w/ 13000+/- miles on it and just had the Rear tire changed due to a nail.I have noticed that when I'm "moving" in 5th gear and I twist the throttle, I hear the engine rev up, but i don't feel anything moving under my seat. What I'm saying is that it feels like the rear wheel is trying to catch up with the transmission speed. My first thought is that the clutch is slipping, but it would do that in all the gears, not just 5th. I have read threads in this forum that the IDS on the rear wheel goes south on the earlier year models of the Ultra's and am putting out a general question to fellow riders of the H-D Ultra's to see if this is my problem or H-D's??