Tyres squeal when the rubber slips against the road, so an occasional chirp from hard cornering or a polished car-park floor is perfectly normal. What's worth investigating is persistent squealing in ordinary, gentle corners, which usually points to under-inflation, poor alignment or worn tyres. Start with pressures, then alignment, and have the tyres checked if grip feels reduced.
When squealing is normal
Some squeal is just physics. Cornering hard, pulling away briskly, or driving on the smooth, sealed surface of a multi-storey car park can all make tyres chirp even when everything's fine. If it only happens when you push on, or on shiny surfaces, there's usually nothing wrong. The concern is squealing during everyday, unhurried driving. Dry, smooth surfaces squeal loudest; on a wet road a slipping tyre tends to hiss or go quiet instead, so the absence of squeal in the rain is not proof of grip.
Under-inflation
A soft tyre flexes and rolls onto its shoulder in corners, which makes it squeal and wears the edges. Under-inflation is the most common and most fixable cause, so check and set your pressures first. It's also a safety issue, because an under-inflated tyre grips and brakes less well, so this one check is always worth doing. Do not rely on the TPMS light to tell you: most systems only warn once a tyre is well below the recommended figure, and a tyre can be soft enough to squeal long before that. Check with a gauge when the tyres are cold, and recheck at least monthly.
Alignment scrub
If pressures are correct and the squealing continues, the tyres may be scrubbing because of alignment that's out. When the wheels aren't pointing quite true, the tyres drag slightly sideways as they roll, which squeals on turns and wears one edge, see uneven wear. The RAC lists squealing tyres when turning, along with uneven tyre wear, as a sign the wheels may be out of alignment (source). This often follows a pothole or kerb knock.
Worn tyres and lost grip
Worn tyres have less grip, so they reach the point of slipping, and squealing, sooner than fresh ones. If the squeal comes with a general feeling of reduced grip, or the tread is getting low on the 20p test, the tyres themselves may be due for replacement. The legal minimum is 1.6mm across the central three-quarters of the tread and around the full circumference (source), but grip fades well before that, so don't wait for the legal limit if grip already feels down.
Squeal, hum or grind: telling the noises apart
A squeal is a high, sharp note that comes and goes with steering input; a hum, drone or grind is something else. Working out which noise you have narrows the cause quickly, because each one points to a different part of the car.
| Noise | When you hear it | Likely cause | Next step |
|---|---|---|---|
| High squeal or chirp | Turning, pulling away, car parks | Tyre slipping: pressure, alignment or worn tread | Check pressures, then alignment |
| Steady hum or drone | Rises with road speed, straight or turning | Uneven tread wear or a tyre pattern noise | See tyre road noise |
| Rumble that changes on bends | Louder turning one way, quieter the other | Wheel bearing | Garage inspection |
| Metallic squeal when braking | Only with the brake pedal pressed | Brake pads or wear indicators | Brake check |
| Rhythmic thump | Constant, speed related | Flat spot, bulge or out-of-round tyre | Inspect the tyre now |
The quick test is to notice what changes the noise. If steering angle changes it, think tyres and alignment. If braking changes it, think brakes. If it is constant at a given speed regardless of what you do with the wheel, think wear, bearings or the tyre's shape.
A five-minute check you can do at home
Most squealing tyres can be diagnosed on the drive with a pressure gauge, a 20p coin and a torch. Do this before booking anything, because the most common cause is the cheapest to fix.
- Pressures, cold. Compare all four to the figure on the door sill or in the handbook. A tyre several PSI down on its partner is your prime suspect.
- Tread depth. Do the 20p test in the centre and both edges. The legal minimum is 1.6mm across the central three-quarters (GOV.UK), but grip in the wet falls away well before that.
- Edge wear. Run your palm across the tread. Sharp, saw-tooth edges on one shoulder mean the tyre is scrubbing sideways, which is alignment.
- Turn the wheel to full lock and look at the inside edge, where wear from bad alignment hides.
- Listen on a quiet road. Take a few gentle roundabouts at normal speed. Squeal on gentle bends after the pressures are correct means the tyres want an alignment check.
If pressures were low, top them up and drive for a week before doing anything else. A tyre that keeps losing air has a leak (a puncture, the valve or the rim seal); if the damage is in the repairable area we can repair it to BS AU 159 at your home or work.
Can suspension or brakes cause the squeal?
Yes, indirectly. Tyres only squeal because they are slipping, but worn suspension parts are a common reason the wheels are no longer pointing where they should. A tired track-rod end, ball joint or bush lets the wheel angle wander under load, so the tyre scrubs in corners even though the last alignment was fine.
This is why an alignment that will not hold, or that drifts back out within a few months, usually needs a suspension inspection first. Fresh settings on worn parts are wasted money. A kerb strike or a deep pothole can bend a component too, so if the squeal started after an impact, say so when you book.
Brakes cause a different noise. A pad wear indicator squeals only when you brake, and a sticking caliper tends to produce heat, smell and a pull rather than a cornering squeal. If the sound is there with your foot off the pedal, it is not the brakes.
Does squealing wear the tyres faster?
Persistent squealing almost always means faster, uneven wear, because the tyre is being dragged rather than rolled. An under-inflated tyre wears both shoulders while the centre looks fine. A misaligned tyre wears one edge, often the inside, where you cannot see it without turning the wheel.
Either way you lose tread life and may end up replacing a tyre that is still deep in the middle. Sorting pressures costs nothing, and an alignment check costs far less than a pair of tyres, so acting on the noise early pays.
Get it checked
We can check pressures, inspect for uneven wear and alignment scrub (an alignment itself is a workshop job we do not offer), and replace worn tyres at your home or work, from our base at Brent Cross, NW2. London and the Home Counties are closest; further out, we tell you on the call whether we can take the job.
