Humming / road noise from front discovery 3. Constant noise / tone / pitch non changing noise. starts at 10mph although only statred 500 miles after changing tyres. It does slightly get quieter on cornering. With 4x4 on 2 poster ramp with wheels off ground when they spin I dont get the noise??

SOURCE: 2005 buick leSabre whine or humming noise from front end.

I had the same problem with my 2000 Buick LeSabre last year. Took it in and they determined the wheel bearing needed to be replaced. Costs about $300 per bearing, but definitely needs to be replaced as you'd be in serious trouble if the thing went out at highway speeds.

SOURCE: 2006 Ford Ranger vibration on steering wheel and noise @ 110 Km/h

Check the idler arm and pittman arm, then the tie rod ends for ANY play. The pittman arm is the one on the steering gearbox that connects to the tie rod, and the idler arm is the one that connects from the tie rod to the frame. Replacing the parts is a pretty inexpensive and straightforward job, but you will need to have the wheels re-aligned afterwards.

SOURCE: Grinding noise in front end

Hi
Had the exact same problem, on a used 2003 Protege ES with 82,000 miles that I purchased.
Started with the loud "road noise" I thought well maybe thats just the sound that it makes.
And then noticed that it varies when turning.
This will continue to get worse and then your abs light will come on when it gets bad enough to trigger the sensor..
It turned out to be a bad wheel bearing.
Take it to a shop and have an experienced mechanic check it out. Its repairable.

SOURCE: 2006 Honda Pilot - Road Noise - not tires.

the tires make steady noise , check the wheel bearing as noises get high and low at the same speed , and i also would check for diff if it's 4wd.

SOURCE: "humming" noise after tire replacement

check the wheel bearing sounds like a problem there.