Tyres wear down evenly when the car is in good shape. Every other wear pattern is the car telling you something. Centre wear means over-inflation. Shoulder wear means under-inflation. Inner edge wear usually means alignment. Cupping usually means suspension. The pattern tells you the cause more reliably than any computer reading on a stationary alignment rig.
This guide walks through the seven most common wear patterns we see at the Tyre Doctors workshop in Knoxfield, with what each one means and what the fix actually costs. If you can read your tyres, you can catch most major suspension and alignment issues before they cost you a set of replacement tyres.
Why your tyre wear pattern matters
A new set of decent tyres on a passenger car costs $700 to $1,500. A premium European-fit set is $1,800 to $3,200. Most of that investment gets thrown away if the car has an unaddressed alignment or suspension fault, because a 1 mm toe error chews 10,000 to 20,000 km off the life of a fresh set.
Catching the wear pattern early means fixing the underlying cause (usually a $90 to $1,400 job) instead of buying a second set of tyres twelve months early. The maths is one-sided: it is always cheaper to fix the car than to replace the tyres again.
How to inspect your tyres in 60 seconds
Park on a flat, well-lit surface with the wheels straight. Then for each tyre:
- Look at the tread from the side. Run your eye across the width and check if one side is more worn than the other.
- Run your hand across the tread, both directions. A smooth feel is fine. A sharp ridge on one side of each tread block means feathering.
- Check the depth with a 20¢ coin or a depth gauge. Slot the coin into the centre groove. If the platypus bill is fully visible, tread is below 3 mm.
- Look at the sidewall. Bulges, cracks, or cuts mean the tyre is finished regardless of tread depth.
Compare the two front tyres against each other, and the two rear tyres against each other. Differences across the same axle are the strongest clue.
The 7 patterns and what they mean
Pattern 1: Centre wear (over-inflation)
The middle of the tread is significantly more worn than the outer edges. The contact patch is bulging in the centre, so the centre carries more load and wears faster.
Cause: Tyre pressure too high for the load. Sometimes the previous workshop set them to a “highway pressure” that was never reset. Common after long road trips where pressures were bumped up.
Fix: Set pressures back to the placard on the driver’s door jamb (not the maximum stamped on the tyre — that is a ceiling, not a target). Check pressures monthly.
Cost: Free at a service station. If the centre wear has gone too deep already, the tyre is finished.
Pattern 2: Shoulder wear, both edges (under-inflation)
Both outer edges of the tread are more worn than the centre. The tyre sidewall is collapsing slightly under load, so the shoulders take more of the work.
Cause: Tyre pressure too low, often for a long time. Under-inflation also creates heat, which is the leading cause of catastrophic tyre failure on highways.
Fix: Set pressures to placard. Inspect for slow leaks (valve stem, nail, alloy wheel corrosion). If pressures keep dropping, get the tyre off and inspected from the inside.
Cost: Free pressure correction. $20 to $60 puncture repair if a leak is found. See puncture repairs.
Pattern 3: Inner shoulder wear only (negative camber)
The inside edge of the tyre (the side facing the centre of the car) is bald or worn down to the wear bars, while the outside edge still has full tread. Usually shows on both front tyres in roughly the same pattern, sometimes only on one.
Cause: Excessive negative camber. The wheel is tilted in at the top so the inside of the tyre carries the full load. Common after a kerb hit, lowering springs, or worn suspension allowing the geometry to shift.
Fix: Four-wheel alignment on a Hunter HawkEye Elite or equivalent. If alignment cannot bring it into spec, a suspension component (lower control arm, strut top, or bush) is bent or worn and needs replacing first. Our post on what a wheel alignment does explains the camber, caster, and toe angles in detail.
Cost: $90 to $180 for alignment alone. $400 to $1,400 if a component needs replacing first.
Pattern 4: Outer shoulder wear only (positive camber, or under-inflation + cornering)
The outside edge of the tread is more worn than the rest. Less common than inner shoulder wear on modern cars.
Cause: Positive camber out of spec, or aggressive cornering with under-inflated tyres. On older cars, sagging springs that have lifted the wheel into positive camber.
Fix: Alignment check first, then suspension inspection if alignment is in spec but the wear is still happening.
Cost: $90 to $180 for alignment. $400 to $1,200 for spring or strut replacement if needed.
Pattern 5: Feathering (toe out of spec)
Run your hand across the tread in both directions. If it feels smooth one way and catches on raised edges the other way, that is feathering. Each tread block has a sharp edge on one side. Often hard to see, easy to feel.
Cause: Toe angle out of spec. The wheels are pointing slightly inward (toe-in too much) or outward (toe-out too much), so the tyre is scrubbing sideways as the car rolls forward.
Fix: Alignment. Toe is the easiest of the three angles to adjust and the most common to be out. Feathering catches early are cheap to fix; left for 5,000 km, the tyres need replacing.
Cost: $90 to $180 for alignment. Tyres often still serviceable if caught quickly.
Pattern 6: Cupping or scalloping (worn suspension)
Patches of high and low wear around the tread, often in a regular pattern that looks like cupped scoops in the rubber. The tyre may hum or roar at certain speeds, even on a smooth road.
Cause: Worn shock absorbers, struts, or wheel bearings. The tyre is bouncing slightly as it rolls, so different parts of the tread bear different loads. Sometimes also caused by severely unbalanced wheels left unaddressed for too long.
Fix: Shock or strut replacement, then alignment. Wheel bearings tested at the same visit. The damaged tyres usually have to be replaced — cupping does not “wear out” once the suspension is fixed.
Cost: $600 to $1,800 for shocks or struts on most cars. Plus replacement tyres. See suspension repairs.
Pattern 7: One-sided diagonal wear (multiple issues)
Wear that starts at the inside edge on one end of the tyre and runs diagonally across to the outside edge at the other. Often combined with cupping.
Cause: A combination of alignment out of spec AND worn suspension. The worst-case scenario for tyre life — the wheel is at the wrong angle AND moving while it rolls.
Fix: Full suspension inspection plus alignment. This usually means lower control arm bushes, strut top mounts, or sway bar links on top of the alignment.
Cost: $800 to $2,500 across parts and labour, plus replacement tyres. The diagnosis itself is straightforward, the bill is not.
Tread wear indicators: the manufacturer’s built-in warning
Every modern tyre has small raised bars at the bottom of the main grooves at 1.6 mm depth (roughly the Australian 1.5 mm legal minimum). When the tread wears down to flush with these bars, the tyre is legally finished. You will see the indicators as small humps in the grooves, usually marked with a small triangle on the sidewall pointing to their location.
You should be planning to replace tyres at 3 mm, not waiting for the wear indicators. Braking distances in wet conditions degrade sharply below 3 mm. By the time the wear indicators are showing, you have been driving on dangerous tyres for thousands of kilometres.
When wear patterns lie
Tyre rotation can mask the underlying cause. If you rotate the tyres every 10,000 km (which is good practice), wear patterns get spread across all four positions and become harder to read.
If you rotate religiously and the tyres still wear unevenly, the cause is on the car, not the rotation pattern. A good workshop will note the position the wear is heaviest in (eg “more wear at the leading edge of the right rear when fitted to the right front”) and use that to track the cause.
Tyre age matters too
Even tyres with full tread can be unsafe if they are old. Rubber hardens over time, loses grip, and develops fine cracks in the sidewall. Most manufacturers recommend replacing tyres every 5 to 7 years regardless of tread depth. Check the DOT date stamp on the sidewall — a four-digit number like “3622” means week 36 of 2022.
If your spare is older than the car, treat it as emergency-only and drive to a workshop, not interstate.
What to do if your tyres are showing one of these patterns
The diagnostic sequence we use in the workshop:
- Visual and tactile inspection. Identify which pattern is present.
- Pressure check against placard.
- Visual suspension inspection for obvious damage, leaking shocks, or torn boots.
- Four-wheel alignment check on the rig (measure first, do not adjust).
- Suspension load test if alignment numbers look fine but wear pattern suggests otherwise.
The first two steps are part of our free tyre check. Steps 3 to 5 are quoted up front if needed.
Frequently asked questions
Can I keep driving on tyres that are wearing unevenly? Short term yes, if there is still 3+ mm of tread across most of the contact patch. Long term no, because the bald spot keeps growing and braking and wet grip drop fast. Fix the underlying cause within a couple of weeks of spotting the pattern.
How often should I check my tyre wear? Monthly during your pressure check. Catching feathering or cupping at 5 mm tread depth means you can fix the cause and still get the remaining tread out of the tyre. Catching it at 2 mm means buying a new set.
Will a wheel alignment fix all uneven tyre wear? Alignment fixes the wear patterns caused by camber, caster, and toe being out of spec. It does not fix wear from worn shocks, bent suspension parts, or under-inflated tyres. The cause has to match the fix.
My tyres are wearing fast but evenly across the tread. What does that mean? Even wear that just happens quickly usually means high mileage, aggressive driving, or a soft summer compound on a car that is doing a lot of kilometres. The tyres are doing their job, just being asked to do it hard.
Why do my front tyres wear faster than the rear? The front tyres do the steering, most of the braking, and (on front-wheel-drive cars) the driving. They will always wear faster. Rotating front-to-rear every 10,000 km evens out the wear life.
Get your wear pattern diagnosed
Bring the car in for a free 15-minute check. We will identify the pattern, tell you the cause, and quote any work before starting.
Tyre Doctors 5/1644 Ferntree Gully Road, Knoxfield VIC 3180 Phone: (03) 9763 0100 · Mobile: 0455 330 000 Hours: Mon–Fri 8 AM to 5 PM, Sat 10 AM to 3 PM, closed Sundays
Related: Wheel Alignment Melbourne · New Tyres — All Brands · Suspension Repair · Wheel Balancing