when i went to test drive the z that i bought i heard a slight noise as the wheels go round.
i presumed that the driver wheel was slightly buckled and that was the sound. (curbed alot)
i have changed the wheel now and the noise is still there!
it sounds like it happens with each revolution of the wheels.
i think its coming from the front drivers wheel. (not very sure though, its hard to tell)
there is a very slight vibration at high speeds.
im thinking poss warped disc, however the sound is still there when i brake.
also a possibility is just the balancing? getting done in the morning.
could it be the wheel bearing considering the sound inst a constant whining but can be heard as the wheel goes round.