I got this bike back in April and it had the sprokets changed and no healer. SO I bought the good speedo healer on the net. Well I used the GPS to set it and then checked it, worked fine. Well I have been sick most of the summer and in and out of the hospital and taken a lot of short rides around home and 2 rides over 150 miles. When I was fooling with it a couple weeks ago to get it ready for winter and getting in the last couple small rides. I noticed I had over 2000 miles on it. There is no way I put that on it this summer any one else have a similar problem?? Don't know what to do??