Wear
Bill...sorry to ressurect this thread after so long but I have recently been having problems with a deep rumbling noise on my 54 Plate Octy VRS Mk 1, I too thought that it was a wheel bearing until I checked the rear tyres, the rear left is VERY 50P shaped, the righ seems to be going the same way and both are at 4-5mm and they are the chinese ones, I have used F1's for 70K miles on my last car and had no problems, they were German made ones, the ones I have on now are chinese and have worn very strangely.
I do mainly Motorway miles and do 2.5K miles per month and check the tyre pressures weekly, the front ones wore as if they were over inflated but I check them when cold and then when warm and set to 32 PSI to take nto account the sustained high speed running.