If you have seen a weird noise like a humming or grinding sound coming from one of your wheels, it is most likely coming from a wheel bearing. These tiny but important parts help your wheels move, and once they start to wear down, they will make a sound long before any other issues arise.
An example of an early symptom includes a low-pitched sound. The pitch becomes louder the faster you go. An example of something that could be dismissed is a rough road or tyre noise. But it is not dismissable as a genuine problem with the road bearings. The issue will typically become more pronounced over time and more consistent rather than it coming and going with the conditions of the road.
With further wear, the sound can become a grinding or rumbling noise, especially when cornering. This occurs because turning puts more load on one side of the bearing, causing the noise to be more noticeable when steering to the left or right.
A failing bearing can also create a clicking noise, particularly on vehicles with a driveshaft near the impacted wheel. This is often an association made with the bearing assembly and is not something that should be overlooked, as it may indicate something more serious.
In addition to the noise, there may be changes in the feel of the car while driving. If the steering wheel is feeling loose and is vibrating through the steering wheel, that could indicate that a bearing may be beginning to wear unevenly.
Having uncommon noises emanating from your wheel examined quickly is a good idea. Bearings can typically be diagnosed by mechanics quite easily through the use of a wheel jack to check for play, or listening for noise changes as he drives the car at various speeds.
Detecting a problem with your bearings early will prevent costly repairs and avoid serious failures, which could jeopardize the safe operation of your wheels under load.