Key takeaways
- Wear down the centre usually means over-inflation; wear on both outer edges usually means under-inflation.
- Wear on just one edge typically points to incorrect wheel alignment (camber or toe).
- A feathered, saw-tooth edge across the tread blocks usually means a tracking (toe) problem.
- Cupping or scalloped patches across the tyre often indicate worn suspension parts such as shock absorbers.
Tyres are honest. The way they wear tells you exactly what is happening with your pressures, alignment, tracking and suspension long before a fault becomes obvious. Learning to read these patterns helps you catch problems early, replace tyres before they become illegal, and avoid throwing money away on rubber that wears out fast because something underneath is wrong. Here is what each pattern means.
What do the main tyre wear patterns mean?
Each common wear pattern points to a specific cause: centre wear means over-inflation, wear on both edges means under-inflation, wear on one edge means an alignment fault, feathering means a tracking problem, and cupping means worn suspension. Reading the pattern tells you not just that a tyre is worn, but why, so you can fix the root cause.
| Wear pattern | Likely cause | What to do |
|---|---|---|
| Centre of tread worn | Over-inflation | Reduce to correct pressure |
| Both outer edges worn | Under-inflation | Inflate to correct pressure |
| One edge worn | Wheel alignment (camber/toe) | Get alignment checked |
| Feathered / saw-tooth | Tracking (toe) error | Get tracking adjusted |
| Cupping / scalloping | Worn suspension parts | Have suspension inspected |
Why does the centre or both edges wear?
Centre wear and edge wear are almost always a pressure problem. If the centre band of the tread is worn more than the edges, the tyre is over-inflated, so it bulges in the middle and rides on its centre. If both outer edges are worn while the centre is healthier, the tyre is under-inflated, so it sags and runs on its shoulders.
Both shorten tyre life and reduce grip, and under-inflation also raises fuel use and blowout risk. The fix is simply correct, regular pressure setting. Our guide on how to check and set your tyre pressure shows where to find the right figures and how to set them when the tyres are cold.
What does wear on one edge mean?
Wear concentrated on just one edge of a tyre, inner or outer, usually means the wheel alignment is out, specifically the camber or toe angle. The wheel is no longer sitting square to the road, so one shoulder of the tyre takes more load and scrubs away faster than the rest of the tread.
Alignment is knocked out by kerb strikes, potholes and general wear. Left uncorrected, it can ruin a new tyre in a few thousand miles. To understand the fix and how it differs from balancing, see wheel alignment vs wheel balancing.
What is feathering and what causes it?
Feathering is when the tread blocks wear into a saw-tooth shape, smooth on one side and sharp on the other, so the tyre feels rough if you run your hand across it one way. It is usually caused by a tracking (toe) error, where the wheels point very slightly inward or outward, making the tread scrub sideways as it rolls.
Tracking is a relatively quick and inexpensive adjustment, and catching feathering early can save a tyre and improve steering feel.
What does cupping or scalloping tell you?
Cupping, also called scalloping, shows up as a series of worn, dished patches spaced around the tyre, often with a wavy or uneven feel. It usually points to worn suspension components, most commonly tired shock absorbers, which let the wheel bounce so the tyre lands harder in some spots than others.
Because cupping is a suspension symptom, simply fitting a new tyre will not solve it; the new tyre will cup as well. It can sometimes be confused with a balance problem, so if you also feel vibration, read the signs your wheels need balancing. Either way, have the suspension and wheels inspected.
Spotted uneven wear? Get it checked
Uneven wear is your tyres warning you that something needs attention, and ignoring it wastes money and risks safety. If a tyre is already worn unevenly past the safe limit, Fast Tyre can replace it at your home or work across London and central England with our mobile tyre fitting service, and advise you on the underlying cause so the new tyre lasts as it should.
Frequently asked questions
You can correct the cause if it is simply pressure, by setting the right figure when cold. Alignment, tracking and suspension faults need professional equipment to diagnose and adjust. The worn tyre itself cannot be reversed, so fix the cause and replace badly worn tyres.
It depends how far the wear has gone. If any part of the tread has dropped below 1.6mm, the tyre is illegal and must be replaced. If wear is uneven but still legal everywhere, fix the underlying cause quickly to stop it getting worse.
At least monthly and before long journeys. A quick visual and hand check across the tread of all four tyres takes a couple of minutes and lets you catch pressure, alignment, tracking and suspension problems before they ruin an expensive tyre or become a safety risk.
Front tyres steer and carry more load, so they show alignment faults first. One-edge wear usually means the camber or toe is out, often after hitting a kerb or pothole. Have the alignment checked, then replace the tyre if it is worn past the limit.
Out-of-balance wheels mainly cause vibration, but over time the resulting bouncing can contribute to uneven or cupped wear. Balancing and alignment are different jobs, so if you feel vibration as well as see uneven wear, have both the balance and the alignment checked.