Uneven tyre wear and what the pattern is telling you
9 min readBy Wheel Fit
The short answer Even wear across the tread is normal. Anything else has a cause, and fitting a new tyre without fixing it just wears out the new one the same way. The pattern tells you which cause you are dealing with.
Reading the pattern
| Where it is wearing | Usual cause | The fix |
|---|---|---|
| Both edges, centre still good | Under-inflation — the tyre bows inward so the shoulders carry the load | Correct pressures, find any leak |
| Centre strip, edges still good | Over-inflation — the middle is doing all the work | Correct pressures to the door plate figure |
| One edge only | Alignment — camber or toe out of specification | Four-wheel alignment |
| Feathered — blocks sharp one side, rounded the other | Toe misalignment | Alignment |
| Patchy or scalloped (cupping) | Worn dampers or bushes, or persistent imbalance | Suspension inspection; rebalance |
| Flat spot in one place | Locked-wheel braking, or long-term standing | Usually replacement |
| One tyre far worse than the rest | Corner-specific fault, or a leak on that wheel | Check that corner specifically |
How to inspect properly
- Cold car, level ground. Do not do this straight after a drive.
- Turn the steering to full lock to expose the inner shoulders of the front tyres.
- Measure tread in three places across each tyre — inner, middle, outer — not just the easy spot.
- Run a hand across the tread, both directions. Feathering feels smooth one way and ragged the other; you can feel it long before you can see it.
- Roll the car forward half a turn and repeat. Cupping and flat spots only show at certain points of the circumference.
- Write the numbers down. A pattern developing over months is invisible without a record.
Under and over-inflation
Together these are the most common cause, and the easiest to fix. A monthly cold pressure check costs nothing and eliminates two of the patterns above. See checking pressures properly.
If one tyre keeps dropping, that is a fault in its own right rather than forgetfulness — why does my tyre keep losing pressure?
Alignment
Alignment goes out through pothole strikes, kerbing and general wear. The classic symptoms are the car pulling to one side on a flat road, or the steering wheel sitting off-centre when you are going straight.
Alignment is a wheel-off-the-car workshop job with proper measuring equipment, so it is not something we do at the roadside. But we will tell you when the wear pattern points at it, because otherwise you will be buying tyres again far too soon. See balancing vs alignment, which are different jobs fixing different problems.
Cupping and suspension
A scalloped, wavy wear pattern usually means the tyre is not being held firmly against the road — worn dampers or bushes letting the wheel bounce. It often comes with a droning noise that changes with speed.
New tyres will quieten it briefly and then develop the same pattern. If you are hearing a drone as well as seeing the pattern, see tyre noise and vibration — it is worth ruling out a wheel bearing at the same time.
The inner edge problem
Wear on the inner shoulder is easy to miss because you cannot see it without turning the wheels to full lock or getting underneath. It is also common, particularly on cars with negative camber at the rear.
Worth checking specifically: turn the steering to full lock and look at the inside shoulder of the front tyres. People fail MOTs on inner-edge wear they had no idea was there — tyre faults that fail an MOT.
Normal front-to-rear difference is not a fault
On a front-wheel-drive car the fronts commonly wear roughly twice as fast as the rears. That is expected, not a fault — the fronts steer, drive and do most of the braking.
Rotating the tyres evens that out and can get more life from a set, subject to some important caveats about directional tyres and never moving your worst rubber to the rear axle. See tyre rotation explained.
What to do, in order
- Check and correct pressures. Re-inspect in a few hundred miles.
- If a single edge is wearing, get the alignment checked.
- If it is cupped or scalloped, get the suspension looked at.
- Only then fit new tyres.
One exception to that order If the tyre is already below the legal limit at any point across the measured band, it needs replacing now, and the cause investigating afterwards. Driving illegally while you book an alignment is not a plan.
Common questions
- Will an alignment fix a tyre that is already worn?
- No. It stops the next one wearing the same way. The damaged tyre stays damaged.
- How often does alignment need doing?
- There is no fixed interval. Have it checked after any significant pothole or kerb strike, and whenever you see one-sided wear developing.
- Can uneven wear be repaired?
- No — wear is not damage that can be patched. If the worn area is within limits the tyre stays in service; if not, it is replaced. Punctures are a separate question: can a puncture be repaired?
- My new tyres wore out fast. Why?
- Most often the underlying cause was never fixed. Alignment and pressures are the two usual suspects, and both are cheap relative to a set of tyres.
Not sure what you are looking at?
Send a photo when you call and we will usually be able to tell you what the pattern means and whether it is a tyre job or a garage job. Call 07989 606060.
