Why Your Tyres Are Wearing on the Outside Edge

Wear concentrated on the outer shoulder of a tyre — the edge nearest the guard — tells you the tyre is leaning out or being scrubbed sideways. It’s less common than inside-edge wear on modern cars but just as expensive if ignored. Here’s what causes outside-edge wear on Australian vehicles, how to tell it apart from a pressure problem, and what fixing it involves.

What does outside-edge tyre wear look like?

Feel across the tread from the inner shoulder to the outer shoulder (the one closest to the outside of the car). Outside-edge wear shows as low or bald tread on that outer band while the middle and inner tread still have depth, sometimes with the wear indicators surfacing on the outer edge first. On keen drivers’ cars it often appears on the front outer shoulders from cornering loads.

What causes tyres to wear on the outside edge?

The tyre wears where the load piles up. Tilt the wheel out at the top, or steer the wheels slightly into each other, and the outer shoulder carries the weight and wears first:

Cause	What’s happening	Typical fix
Positive camber	Top of the wheel tilts outward, loading the outer shoulder	Wheel alignment; check for worn/sagged suspension
Toe-in	Wheels point slightly toward each other, scrubbing the outer edges	Wheel alignment (toe reset)
Hard or frequent cornering	Cornering forces roll the car onto the outer shoulders	Driving style; correct pressure; rotation
Chronic underinflation (both outer + inner shoulders)	Low pressure lets both shoulders dig in — rule this out first	Set to placard pressure, cold
Worn suspension / sagging springs	Geometry shifts and won’t hold an alignment	Replace worn parts, then align

Yokohama Australia notes that “excessive camber causes premature outer or inner shoulder wear” and that excessive toe “results in feathered edges and increases fuel consumption.” Outer-shoulder-only wear is a camber and toe signature, not a pressure one.

Is it alignment, cornering, or pressure?

Start with air. Underinflation wears both shoulders at once and evenly (see underinflation effects), so set the tyres to the placard pressure cold — Bridgestone Australia advises following the placard, not the sidewall maximum, with most cars between 30–36 psi — and re-check. If only the outer edge wears with correct pressure, it’s geometry. If it’s the outer front shoulders on a car that gets driven hard through corners, cornering load is a factor even with good alignment; smoother cornering and regular rotation help.

How do I tell outside-edge wear from inside-edge wear?

Position is the whole story. Wear on the edge nearest the guard is outside (positive camber/toe-in); wear on the edge nearest the car’s centreline is inside (negative camber/toe-out — see inside-edge wear). Wear across the middle is centre wear from overinflation. For the full map of patterns, see how to read wear patterns like a mechanic.

Can I keep driving on outside-edge wear?

Only if the whole tyre still has legal tread. Australia’s legal minimum is 1.5mm in all principal grooves, so if the outer edge has dropped below that the tyre is illegal and will fail a roadworthy, pink slip or safety certificate — regardless of the healthy tread further in (see the 1.5mm rule). The outer shoulder also does a lot of the work in cornering and wet braking, so worn there is worse than it looks.

What does it cost to fix?

A wheel alignment in Australia is typically about $60–$120 as a guide in 2026, more for a four-wheel alignment; confirm locally. If sagging springs or worn bushes are behind the positive camber, add parts and labour. And if the outer edge is already worn out, no alignment brings it back — the tyre needs replacing.

How do I stop it coming back?

Keep pressures at placard, get a wheel alignment after kerb strikes, potholes or suspension work and roughly every 10,000km, and rotate your tyres so cornering load is shared across all four. If you enjoy a spirited drive, slightly firmer (still within placard/manufacturer range) pressures and disciplined rotation are your friends. Have springs and bushes checked at service if the car sits low at one corner.

Bottom line: Outside-edge wear means the outer shoulder is carrying too much — positive camber, toe-in or cornering, with underinflation the usual suspect when both shoulders go together. Confirm pressure, then align and inspect the suspension, and don’t let a worn outer edge fail your next inspection.

Frequently asked questions

Why is only the outside edge of my tyre wearing?

The wheel is leaning out (positive camber) or toeing in, or cornering forces are loading the outer shoulder. Both-shoulder wear instead points to low pressure.

Does hard cornering wear the outside edge?

Yes. Cornering rolls weight onto the outer shoulders, so keen drivers often see outer-front wear even with good alignment. Correct pressure and regular rotation reduce it.

Can low tyre pressure cause outside-edge wear?

Underinflation wears both shoulders together, not just the outer. If only the outer edge is going, look to camber, toe or cornering — but check pressure first.

Is outside-edge wear illegal in Australia?

If any principal groove, including the outer edge, is below 1.5mm, the tyre is illegal and will fail a state inspection even if the rest has tread.

Will a wheel alignment fix outside-edge wear?

It stops further wear when misalignment is the cause and the suspension is sound, but it can’t recover lost tread and won’t hold if springs or bushes are worn.

External references: Yokohama Australia — Wheel Alignment and Bridgestone Australia — Tyre Pressure Guide.

Figures and rules change — confirm tread limits with your state road authority and pricing with your tyre fitter.