I take it you mean the tyres can distort?

Yeah thats the one. Not sure if they ever come back, but the ones on Fake when it stood for 3 years are egg shaped, and lumpy when I moved it out!

They can go back into shape but I would think after a few years of uneven weight there going to be buggered. This would probably show when you balance them though.

you have pm
thanks lee

just a quick bit to add - i had a shake at the same speed and it turned out to be the casing of my rear tyre had twisted and the wire inside was poking out.

it was caused by an over enthusiastic donut in a car park and the tyre just sat there me spinning round and the casing got twisted.

i didnt notice it until i was going about 70 or 80.

this probably won't help but it may?

I had the same problem, turned out to be a broken urethane steering coupling, half snapped. Was days away from giving out, glad I had it checked. Part only cost (equivalen of) 15 pounds.