I noticed that too. NO biggy... the only other problem I have is now I want a full set for my Street Glide!!!!!!!! damn it!It's normal when accelerating. I notice it all the time when I accelerate hard and it is worse when you hit that resonant frequency what ever the update rate is. Take a look at one of Raywood's video and you will also see it when he accelerates. In fact, I believe it is hard to make out his speed because of the frame speed of the camera.
