Right then, I hope someone can help me please. I used to have a slight vibration through the steering at about 50 to 65mph. I had some new front tyres last weekend and had the front swapped to the back. They balanced all four wheels. I've now got a more severe vibration but at about 35 to 40mph. So I went back and I've had them all re-balanced. Somehow they'd gone slightly out in 1 week. So I'm stumped. Do I have a warped wheel. and if I had, would it never balance? Or could it be bent the other way, e.g into a slight ellipse? My steering seems to have started making much more of a knocking noise now too! I really noticed it the other day going over snow which had been made into 'tracks'. So is the steering rack screwed too? All the antiroll bars and drop link things seem solid. Sorry for the life story. Thanks guys and gals.