I've had my car for about 2 months, and its always had a droning noise when on the move. At first i put it down to the 18" p-zeros (had 'em in 17 before and i remember alot of road noise). I'm getting even more paranoid now though and was even wondering if it was a dodgy wheel bearing, or worse, the gearbox whining!
Can i put this noise down to the tyres? are 18" p-zeros really that noisy?

 

Which P Zeros? If its the Neros then yes they are quite noisey.