2003 Corolla with 125K. Hearing loud humming noise from rear passenger side after accelerating above 30mph. Much louder than road noise and replacing tires didn't reduce noise. Been driving with the noise for several months without incident.

sound like transmission oil pump noise if you hear noise when vechicle accelerating moving.

run the fault codes
no fault codes , check for loose mud flaps , trim , wheel trim etc

most likely if its a hum it could be tires , if its a roar it could be the drive train

support the vehicle on jack stands , start the engine , put in drive and let it idle, if noise is gone ...its the tires if not check the drive train ...start with fluid levels

That loud humming noise you are hearing is the wheel bearing. After hitting the curb the bearing took a hit and became a little wobbly and over time the grease has seeped out and started causing the humming.So just replace the wheel bearing and anything else that might be loose or damaged like the tie rod and ball joints. if those issues are not corrected it might happen again down the road. good luck and glad to shed some light on your issue

It sounds like a bad tire, possibly a broken belt. Check the sidewalls and tread of all the tires for bulges. If good it probably is a bad wheel bearing. Try to isolate from where and what side. If the noise gets louder turning one direction but not the other, then more likely a bearing. If it stays constant both directions but gets louder with speed, then suspect a tire.

Serpentine belt tightener pulley bearing was bad, made a loud noise. I replaced the pulley (jobber part) and the noise level was reduced enough to notice the waterpump was also making a noise ... more revs = louder noise. I am now replacing the water pump. (approx 60k Miles too).

I had a similar issue and it ended up being a broken wheel bearing. I even ended up having two, one was broken on my front passenger side, and one broken on my rear driver side. The part costs about $280.00, but could cost around $400.00 with service repair. The noise of a broken wheel bearing can sound like a humming, and over time it becomes louder. The car can be driven with a broken wheel bearing, but doing so can eventually lead to other wheel/tire maintenance. MINI's endure this commonly due to their low profile to the ground. Here is a forum on further issues experienced, including the bearing, and efforts towards recalls. http://newmini.wordpress.com/2009/02/17/mini-cooper-power-steering-failure/#comment-884

rear bearings , Turn steering wheel side to side to side while driving that will load the bearing on that side see if the noise changes

make sure your tire is ok and is not r ubbing on anything and check your drivetrain ujoint`s etc.

Try rear wheel bearings. The cause a roaring noise that increases with acceleration. Sounds very similar to loud road noise.