Reading Uneven Tyre Wear: What Each Pattern Is Telling You

A tyre wears out. That’s the job. But when it wears out unevenly — bald on one shoulder, scalloped in patches, feathered across the tread — the tyre isn’t the problem. It’s the messenger. Something else on the truck is wrong, and the tyre is paying for it.

If you replace the worn tyre without fixing what caused the wear, the new one wears out the same way. That’s not a tyre cost. That’s a recurring tyre cost, and it’s avoidable.

Here’s how to read the common patterns and what each one is usually telling you.

Both shoulders worn, centre fine — underinflation

When a tyre runs underinflated, the carcass flattens and the load shifts onto the two outer edges. The shoulders take a beating while the centre of the tread barely touches. You’ll feel it as a tyre that’s wearing fast for no obvious reason.

The fix is rarely the tyre — it’s air. Check pressures cold, before the truck has run, and set them to the load you’re actually carrying. Don’t forget the inners on duals, where a slow leak hides for weeks. Underinflation also builds heat in the carcass, which is how an “early wear” problem quietly becomes a “blowout on the Hume” problem.

Centre worn, shoulders fine — overinflation

The opposite pattern, and the opposite cause. Too much pressure crowns the tread so only the centre rib carries the load. You lose tread life in the middle and you lose grip, because less rubber is meeting the road.

Operators sometimes overinflate deliberately, thinking it saves fuel or “firms up” the ride. Past the correct figure for the load, it just wears the centre out early. Set pressure to the load, not to a hunch.

One shoulder only — alignment or worn components

When a single edge — usually the inner or outer shoulder of a steer tyre — wears faster than the rest, the wheel isn’t sitting square to the road. Common causes are alignment that’s drifted out, worn kingpins or wheel bearings, or a bent component after a solid kerb or pothole hit.

This one’s worth catching early, because steer tyres are the position you never want to economise on. A steer wearing hard on one edge is both a cost and a handling risk. If you’re seeing it, the tyre may need replacing, but the alignment and front-end components are what actually need looking at.

Feathering across the ribs — toe and alignment

Run your hand sideways across the tread. If the ribs feel sharp on one edge and rounded on the other — smooth one way, like a saw the other — that’s feathering. It’s caused by the tyre being dragged slightly sideways as it rolls, almost always a toe (alignment) issue, sometimes worn steering or suspension joints.

You’ll often hear it before a workshop confirms it: a low hum or growl from the front that some people mistake for a wheel bearing or a noisy tyre pattern. A proper alignment check sorts the cause.

Cupping or scalloping — balance and worn dampers

Dips around the tread at regular intervals — cupping, sometimes called scalloping — come from the tyre bouncing rather than rolling cleanly. The usual culprits are an out-of-balance assembly or tired shock absorbers and bushes letting the wheel hop.

For heavy vehicles, this is where balancing method matters. On-vehicle balancing can’t correct for drum or hub-face run-out, so it can leave a vibration in place that quietly cups the tread. Off-vehicle balancing isolates the wheel assembly and is the engineering-sound choice for trucks. If you’ve got cupping across several tyres, balance and suspension are the first places to look — not the tyre brand.

A quick walk-around habit

Most of these patterns are visible and findable in a couple of minutes:

• Look across the full tread width, both shoulders, inners on duals included.
• Run a hand sideways across the ribs to catch feathering you can’t see.
• Note anything one-sided or patchy and check pressures cold before you blame the tyre.
• Log it — a dated note per vehicle turns “that tyre looked odd” into a maintenance record, which is exactly what your WHS obligations expect of a fleet.

Catch the pattern early and you’re often fixing a $150 alignment instead of buying the same tyre twice.

Get a second opinion before you replace

Uneven wear is a diagnosis problem as much as a tyre problem. If a tyre’s wearing in a way you can’t explain, it’s worth an honest look before you spend on a replacement that’ll go the same way.

Ruband Tyres has been keeping commercial vehicles on the road since 1998. For a tyre and wear inspection, a balancing check, or honest specification advice — or 24/7 emergency roadside assistance for trucks — call our Melbourne depot at Bayswater North on (03) 9729 8799, or our Hobart depot at Derwent Park on (03) 6272 7500. You can also request a quote and we’ll get back to you.