A hum or drone that rises with speed is one of the trickier noises to pin down, because two very different parts make almost the same sound: the tyres and a wheel bearing. One simple test separates them, and the tyre side comes down to wear.
The cornering test
This is the diagnosis in one move. At a steady speed on a quiet road, weave a gentle S left and right:
- Noise louder turning one way, quieter the other, a wheel bearing, on the side that loads up
- Noise roughly the same through both turns, the tyres, and their wear pattern
It works because cornering shifts the car's weight onto one set of bearings, so a worn one speaks up. Tyres, rolling at much the same rate, stay steady.
When it is the tyres
A droning tyre almost always has an uneven tread surface:
- Cupping or scalloping: scooped patches around the tread, per cupping and scalloping
- Feathering: tread blocks worn sharp on one edge, which you can feel by hand, covered under feathering wear
Both usually trace back to an alignment or balance fault left to run, so fixing the cause as well as swapping the tyres stops it returning. The wider picture of tyre noise sits under the causes of tyre road noise.
When it is a bearing
A bearing hum grows over weeks, changes with cornering, and may come with a faint roughness felt through the car. It is not a tyre fix, and a badly worn bearing should be sorted promptly because, unlike most tyre noise, it can eventually seize.
From the workshop: the slalom test has settled more arguments than anything else I do. Customer's convinced it's the tyres, we do a gentle weave, the drone swells turning right, and that's a nearside bearing, not four new tyres. Costs nothing to try and it points you the right way every time.
Sources and accuracy. This reflects standard diagnosis at the time of writing. A growing hum or any wheel play should be checked promptly. If anything here looks wrong, get in touch and we will check it and put it right.
Common questions
What is the humming noise from my tyres at speed?+
A hum or drone that rises with road speed is usually one of two things: uneven tyre wear, such as cupping or feathering, or a worn wheel bearing. The way the noise responds to gentle cornering tells them apart, since a bearing changes with the turn and worn tyres largely do not.
How do I know if it is a wheel bearing or a tyre?+
Drive a gentle S-shape at a steady speed. If the drone gets louder turning one way and quieter the other, it is a wheel bearing on the loaded side. If it stays much the same through the turns, it is more likely the tyres and their wear pattern.
Can tyres cause a droning noise?+
Yes. Cupped, scalloped or feathered wear gives the tread an uneven surface that drones or roars as it rolls, often after an alignment or balance fault was left unfixed. Swapping the affected tyres and correcting the cause clears it.
Is a humming wheel bearing dangerous?+
A bearing rarely fails suddenly, but a worsening hum should not be ignored, because a badly worn bearing can seize. If the noise is growing or there is any play in the wheel, get it checked promptly rather than waiting.