Wobbles all the time but varies in intensity. At about 80 the wobble is fast and easy to control, as you slow down the wobble becomes more intense and I have to hang on, not good on mountain roads...

I am sorta going in the direction that the tyre has a problem. I will probably run down to my local performance shop (these guys race bikes) and let them have a look.

I suppose I could live with it until I trash the tyre but it is peacing me OFF!