squeaky noises - i hate them

Bike is squeaking again, this time i've narrowed it down to the wheels or possibly the chain or i dont know. I dont really know anything about taking wheels off and bearing lubrication...
It starts squeaking above 30 km/h and progresses with speed only. I've shut off the engine (on the freeway) and listened to it whilst rolling along at 70 and it still squeaks until about 30 km/h. Also jammed the breaks on and off to make sure they weren't rubbing.
Last time the problem was the chain squeaking but a quick lube fixed it. Not this time.
The chain is lubed up more than a hooker on saturday night but could it still be squeaking if its dirty and lubed?
Could it be the wheel bearings...i have no idea in this case. Or something else....
cheers
It starts squeaking above 30 km/h and progresses with speed only. I've shut off the engine (on the freeway) and listened to it whilst rolling along at 70 and it still squeaks until about 30 km/h. Also jammed the breaks on and off to make sure they weren't rubbing.
Last time the problem was the chain squeaking but a quick lube fixed it. Not this time.
The chain is lubed up more than a hooker on saturday night but could it still be squeaking if its dirty and lubed?
Could it be the wheel bearings...i have no idea in this case. Or something else....
cheers