Tyre rotation thump

[rogkildare]

On pulling away from cold in my 1996 C180 a thumping noise in time with tyre rotation occurs as though something is attached to the rear tyre, and you can also feel it through the seat. It only lasts about 30 seconds and is then completely smooth. This only happens from cold and I would have thought if it was a tyre fault it would have been constant. Any ideas would be welcome.

 

[walsi]

It could be some water trapped in the tyre and it is freezing but upon driving it breaks up and spreads around the wheel. My bike used to do it when it had "slime" in it and had stood for a few weeks. I would still check the tyres for an egg on the back though. The only other thing that springs to mind is propshaft centre bearing

Cheers Martin