The speed wobble is caused by the air flow of the screen. When my tracer was standard I had a slight wobble at high speed, then I put a givi screen on and had very bad wobbles at about 120. I then fitted a steering damper and a powerbronze sports screen, then there was no wobble at any speed. I recently went touring so I put the givi screen on to give me a little more protection, and even with a steering damper the wobble was back at about 120 again. When I got home I put the powerbronze screen back on and no more wobbles. All these theories that people keep coming up with about the cause of speed wobble, start with the screen especially if you have an aftermarket one.