If your vehicle is showing humming or roaring noise that gets louder with vehicle speed, here are the most likely causes and the parts you'll need to fix each one.
The bearings that allow your wheels to spin smoothly wear out over time, creating a low-pitched hum or roar that increases with speed and often changes pitch when steering.
Tires that wear unevenly due to lack of rotation, worn suspension components, or bad alignment create a roaring sound that closely mimics a bad wheel bearing.
Some tires have a specific tread pattern meant to roll in only one direction. Mounting them backward during a recent tire service causes excessive road noise and roaring.
On rear-wheel or all-wheel drive vehicles, the bearing supporting the middle of the driveshaft can fail, causing a hum or vibration directly under the center console.
Bearings inside the differential can wear out or become damaged from low fluid, creating a constant roaring noise from the front or rear axle that scales with vehicle speed.